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Superconductivity of platinum hydride

Physical Review B 2019年第14期99卷 144511-144511页

作者： Takahiro Matsuoka Masahiro Hishida Keiji Kuno Naohisa Hirao Yasuo Ohishi Shigeo Sasaki Kazushi Takahama Katsuya Shimizu Department of Electrical Electronic and Computer Engineering Faculty of Engineering Gifu University Gifu 501-1193 Japan Department of Materials Science and Technology Gifu University Gifu 501-1193 Japan Environmental and Renewable Energy Systems Division Gifu University Gifu 501-1193 Japan Japan Synchrotron Radiation Research Institute (JASRI) Hyogo 679-5198 Japan Center for Science and Technology under Extreme Conditions Graduate School of Engineering Science Osaka University Osaka 560-8531 Japan

We report the ac magnetic susceptibility, electrical resistance, and x-ray diffraction measurements of PtHx(x≃1) in diamond anvil cells, that reveal the superconducting transition. At 30 GPa, when PtHx is in a P63/mmc structure, PtHx exhibits the superconducting transition at 7 K. Remarkably, the observed Tc is higher than that of powdered Pt by more than three orders of magnitude. It is suggested that the noble metals in the periodic table of elements possibly form a region where hydrides have higher Tc than elements.

关键词： Pressure effects Superconducting phase transition Hydrides Low-temperature superconductors AC susceptibility measurements Resistivity measurements X-ray powder diffraction

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P10.25.A ATR INHIBITION IN EXPERIMENTAL GLIOMA: DISCOVERY AND VALIDATION OF MOLECULAR TARGETS FOR FUNCTIONALLY-INSTRUCTED COMBINATION THERAPIES

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Neuro-Oncology 2023年第SUPPLEMENT_2期25卷 ii68–ii68页

作者： Walter, B Hirsch, S Kuhlburger, L Stahl, A Schnabel, L Haeusser, L A Tsiami, F Ploeger, S Aghaallaei, N Dick, A M Skokowa, J Schmees, C Templin, M Schenke-Layland, K Tatagiba, M Nahnsen, S Merk, D Tabatabai, G Hertie Institute for Clinical Brain Research Tübingen Germany Quantitative Biology Center Eberhard Karls University Tübingen Tübingen Germany Biomedical Data Science Department of Computer Science Eberhard Karls University Tübingen Tübingen Germany NMI Natural and Medical Sciences Institute at the University of Tübingen Reutlingen Germany German Consortium for Translational Cancer Research (DKTK) Partner site Tübingen Tübingen Germany Division of Translational Oncology Department of Internal Medicine II University Hospital Tübingen Tübingen Germany Institute of Biomedical Engineering Dept. for Medical Technologies and regenerative Medicine Eberhard Karls University Tübingen Tübingen Germany Center for Neuro-Oncology Comprehensive Cancer Center Tübingen-Stuttgart Eberhard Karls University Tübingen Tübingen Germany

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Ultracool dwarfs candidates based on 6 yr of the Dark Energy Survey data

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MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 2023年第2期522卷 1951-1967页

作者： dal Ponte, M. Santiago, B. Carnero Rosell, A. De Paris, L. Pace, A. B. Bechtol, K. Abbott, T. M. C. Aguena, M. Allam, S. Alves, O. Bacon, D. Bertin, E. Bocquet, S. Brooks, D. Burke, D. L. Kind, M. Carrasco Carretero, J. Conselice, C. Costanzi, M. Desai, S. De Vicente, J. Doel, P. Everett, S. Ferrero, I Flaugher, B. Frieman, J. Garcia-Bellido, J. Gerdes, D. W. Gruendl, R. A. Gruen, D. Gutierrez, G. Hinton, S. R. Hollowood, D. L. James, D. J. Kuehn, K. Kuropatkin, N. Marshall, J. L. Mena-Fernandez, J. Menanteau, F. Miquel, R. Ogando, R. L. C. Palmese, A. Paz-Chinchon, F. Pereira, M. E. S. Plazas Malagon, A. A. Pieres, A. Raveri, M. Rodriguez-Monroy, M. Sanchez, E. Scarpine, V Schubnell, M. Sevilla-Noarbe, I Smith, M. Soares-Santos, M. Suchyta, E. Swanson, M. E. C. Tarle, G. Thomas, D. To, C. Weaverdyck, N. Instituto de Física UFRGS Caixa Postal 15051 Porto Alegre RS-91501-970 Brazil Laboratório Interinstitucional de e-Astronomia - LIneA Rua Gal. José Cristino 77 Rio de Janeiro RJ-20921-400 Brazil Instituto de Astrofisica de Canarias E-38205 La Laguna Tenerife Spain Universidad de La Laguna Dpto. Astrofísica E-38206 La Laguna Tenerife Spain McWilliams Center for Cosmology Carnegie Mellon University 5000 Forbes Ave Pittsburgh PA 15213 USA Physics Department University of Wisconsin-Madison Madison WI 53706 USA Cerro Tololo Inter-American Observatory NSF’s National Optical-Infrared Astronomy Research Laboratory Casilla 603 La Serena Chile Fermi National Accelerator Laboratory PO Box 500 Batavia IL 60510 USA Department of Physics University of Michigan Ann Arbor MI 48109 USA Institute of Cosmology and Gravitation University of Portsmouth Portsmouth PO1 3FX UK CNRS UMR 7095 Institut d’Astrophysique de Paris F-75014 Paris France Sorbonne Universités UPMC Univ Paris 06 UMR 7095 Institut d’Astrophysique de Paris F-75014 Paris France University Observatory Faculty of Physics Ludwig-Maximilians-Universität Scheinerstr. 1 D-81679 Munich Germany Department of Physics & Astronomy University College London Gower Street London WC1E 6BT UK Kavli Institute for Particle Astrophysics & Cosmology PO Box 2450 Stanford University Stanford CA 94305 USA SLAC National Accelerator Laboratory Menlo Park CA 94025 USA Center for Astrophysical Surveys National Center for Supercomputing Applications 1205 West Clark St. Urbana IL 61801 USA Department of Astronomy University of Illinois at Urbana-Champaign 1002 W. Green Street Urbana IL 61801 USA Institut de Física d’Altes Energies (IFAE) The Barcelona Institute of Science and Technology Campus UAB E-08193 Bellaterra (Barcelona) Spain Jodrell Bank Center for Astrophysics School of Physics and Astronomy University of Manchester Oxford Road Manchester M13 9PL UK University of Nottingham School of Physics and Astrono

We present a sample of 19 583 ultracool dwarf candidates brighter than z <= 23 selected from the Dark Energy Survey DR2 coadd data matched to VHS DR6, VIKING DR5, and AllWISE covering similar to 480 deg(2). The ultracool candidates were first pre-selected based on their (i-z), (z-Y), and (Y-J) colours. They were further classified using a method that compares their optical, near-infrared, and mid-infrared colours against templates of M, L, and T dwarfs. 14 099 objects are presented as new L and T candidates and the remaining objects are from the literature, including 5342 candidates from our previous work. Using this new and deeper sample of ultracool dwarf candidates we also present: 20 new candidate members to nearby young moving groups and associations, variable candidate sources and four new wide binary systems composed of two ultracool dwarfs. Finally, we also show the spectra of 12 new ultracool dwarfs discovered by our group and presented here for the first time. These spectroscopically confirmed objects are a sanity check of our selection of ultracool dwarfs and photometric classification method.

关键词： surveys brown dwarfs stars: low-mass

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The effect of introducing antibiotics into organic light-emitting diodes (vol 2, 130, 2019)

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COMMUNICATIONS PHYSICS 2019年第1期2卷 1-13页

作者： Hafeez, Hassan Jesuraj, P. Justin Kim, Dong Hyun Lee, Jong Chan Shin, Jun Young Rhee, Sang Ho Lee, Won Ho Choi, Dae Keun Cha, Jun Hwan Lee, Chang Min Kim, Chul Hoon Lamichhane, Janardan Pokhrel, Anaya Kim, Tae-Su Sohng, Jae Kyung Yun, Hyung Joong Park, Jong Bae Chung, Hee-Suk Bae, Tae-Sung Lee, Sang Geul Park, Hyun-Woo Chung, Kwun-Bum Song, Aeran Kwon, Jang Hyuk Bae, Hyeong Woo Kang, Yong-Cheol Park, Juyun Song, Myungkwan Kim, Chang-Su Ryu, Seung Yoon Division of Display and Semiconductor Physics Display Convergence College of Science and Technology Korea University Sejong Campus 2511 Sejong-ro Sejong City Republic of Korea Department of Information Communication & Display Engineering Division of Mechanical and ICT Convergence Engineering Sun Moon University Asan Republic of Korea Department of Advanced Materials Chemistry College of Science and Technology Korea University Sejong Campus 2511 Sejong-ro Sejong City Republic of Korea Department of Life Science and Biochemical Engineering SunMoon University Asan-si Korea Advanced Nano Surface Research Group Korea Basic Science Institute (KBSI) Daejeon Republic of Korea Jeonju Center Korea Basic Science Institute (KBSI) Jeonju Republic of Korea Daegu Center Korea Basic Science Institute (KBSI) Daegu Republic of Korea Division of Physics and Semiconductor Science Dongguk University Seoul Republic of Korea Department of Information Display Kyung Hee University Seoul Republic of Korea Department of Chemistry Pukyong National University Nam-gu Republic of Korea Surface Technology Division Korea Institute of Materials Science (KIMS) Changwon Changwon Republic of Korea

The quest to improve the performance of organic light-emitting diodes (OLEDs) has led to the exploration of new materials with properties like interfacial dipole, excitons generation, and bandgap alignment. Here, we exploit these strategies by investigating the interaction of the antibiotic ampicillin with a widely used optoelectronic material, to fabricate state-of-the-art OLEDs. The charge distribution on the ampicillin molecule facilitates the generation of an interfacial dipole with a large magnitude. The optimum fusion of the two materials provides an enhanced bandgap alignment, charge balance and J/H-aggregated excitons. Values of current efficiency (120 cdA−1), external quantum efficiency (~35%) and power efficiency (70 lmW−1) are demonstrated. The cross-evaluation of performance with penicillin devices indicates the significance of ampicillin’s specific molecular structure in improving performance. The detailed investigations demonstrate that ampicillin has superior optoelectronic properties with high potential to contribute extensively in OLEDs and photovoltaics.

关键词： Antibiotics

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Predicting Spring Phenology in Deciduous Broadleaf Forests: An Open Community Forecast Challenge

SSRN

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SSRN 2023年

作者： Wheeler, Kathryn I. Dietze, Michael C. LeBauer, David Peters, Jody Richardson, Andrew D. Thomas, R. Quinn Zhu, Kai Bhat, Uttam Munch, Stephan Buzbee, Raphaela Floreani Chenp, Min Goldstein, Benjamin Guo, Jessica S. Haoq, Dalei Jones, Chris Kelly-Fair, Mira Liup, Haoran Malmborg, Charlotte Neupane, Naresh Pal, Debasmita Ross, Arun A. Shirey, Vaughn Song, Yiluan Steen, McKalee Vance, Eric A. Woelmer, Whitney M. Wynne, Jacob Zachmann, Luke Department of Earth and Environment Boston University 685 Commonwealth Avenue BostonMA02215 United States Cooperative Programs for the Advancement of Earth System Science University Corporation for Atmospheric Research Foothills Laboratory Bldg 4 3300 Mitchell Lane BoulderCO80301 United States National Oceanic and Atmospheric Administration Foothills Laboratory Bldg 4 3300 Mitchell Lane BoulderCO80301 United States Department of Civil and Environmental Engineering Massachusetts Institute of Technology 15 Vassar St CambridgeMA02142 United States Arizona Experiment Station University of Arizona 1230 N Cherry Ave TucsonAZ85721 United States Department of Biological Sciences University of Notre Dame 100 Galvin Notre DameIN46556 United States School of Informatics Computing and Cyber Systems Northern Arizona University 1295 Knoles Dr. FlagstaffAZ86011 United States Center for Ecosystem Science and Society Northern Arizona University PO Box 5620 FlagstaffAZ86011 United States Department of Forest Resources and Environmental Conservation Virginia Polytechnic Institute State University 310 West Campus Drive BlacksburgVA24061 United States Department of Biological Sciences Virginia Polytechnic Institute State University 926 West Campus Drive BlacksburgVA24061 United States Institute for Global Change Biology University of Michigan 440 Church Street Ann ArborMI48109 United States School for Environment and Sustainability University of Michigan 440 Church Street Ann ArborMI48109 United States Institute of Marine Sciences University of California Santa Cruz 1156 High Street Santa CruzCA95060 United States Department of Applied Mathematics University of California Santa Cruz 1156 High Street Santa CruzCA95060 United States Department of Environmental Science Policy and Management University of California Berkeley 4004 Valley Life Sciences Building University of California Berkeley BerkeleyCA94720 United States Department of For

Accurate phenology models are important to predict how global climate change will continue to alter the timing of plant phenological events, such as spring greenup in deciduous broadleaf forests. While there is merit in long-term predictions, investigating how models can predict near-term (1– 35 days) canopy greenness throughout the spring allows us to validate performance and understanding now. The Ecological Forecasting Initiative’s NEON Forecasting Challenge, is an open challenge to the community to predict daily greenness values, measured through digital images collected by the PhenoCam Network at National Ecological Observatory Network (NEON) sites. For the first round of the challenge, which is presented here, teams were tasked to forecast phenology at eight deciduous broadleaf sites. A total of 192,536 predictions were submitted, representing eighteen models, including a persistence and a day of year mean null models. We found that forecast skill was highest when forecasting earlier in the greenup curve compared to the end, for shorter lead times, for sites that greened up earlier, and when submitting forecasts during times other than near budburst. The models based on day of year historical mean had the highest predictive skill across the challenge period. In this first round of the challenge, by synthesizing across forecasts, we started to elucidate what factors affect the predictive skill of near-term phenology forecasts, which future rounds will continue to investigate. © 2023, The Authors. All rights reserved.

关键词： Forecasting

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The Extended [CII] under Construction? Observation of the brightest high-z lensed star-forming galaxy at z = 6.2

arXiv

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arXiv 2023年

作者： Fudamoto, Yoshinobu Inoue, Akio K. Coe, Dan Welch, Brian Acebron, Ana Ricotti, Massimo Mandelker, Nir Windhorst, Rogier A. Xu, Xinfeng Sugahara, Yuma Bauer, Franz E. Bradač, Maruša Bradley, Larry D. Diego, Jose M. Florian, Michael Frye, Brenda Fujimoto, Seiji Hashimoto, Takuya Henry, Alaina Mahler, Guillaume Oesch, Pascal A. Ravindranath, Swara Rigby, Jane Sharon, Keren Strait, Victoria Tamura, Yoichi Trenti, Michele Vanzella, Eros Zackrisson, Erik Zitrin, Adi Waseda Research Institute for Science and Engineering Faculty of Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka Tokyo Japan Department of Physics School of Advanced Science and Engineering Faculty of Science and Engineering Waseda University 3-4-1 Okubo Shinjuku Tokyo169-8555 Japan 3700 San Martin Drive BaltimoreMD21218 United States STScI BaltimoreMD United States Center for Astrophysical Sciences Department of Physics and Astronomy The Johns Hopkins University 3400 N Charles St. BaltimoreMD21218 United States Department of Astronomy University of Maryland College ParkMD20742 United States Observational Cosmology Lab NASA Goddard Space Flight Center GreenbeltMD20771 United States Center for Research and Exploration in Space Science and Technology NASA/GSFC GreenbeltMD20771 United States Dipartimento di Fisica Università degli Studi di Milano Via Celoria 16 MilanoI-20133 Italy INAF - IASF Milano via A. Corti 12 MilanoI-20133 Italy Department of Astronomy University of Maryland College Park20742 United States Centre for Astrophysics and Planetary Science Racah Institute of Physics The Hebrew University Jerusalem91904 Israel School of Earth and Space Exploration Arizona State University TempeAZ85287-1404 United States Center for Astrophysical Sciences Department of Physics & Astronomy Johns Hopkins University BaltimoreMD21218 United States Instituto de Astrofísica Facultad de Física Pontificia Universidad Católica de Chile Campus San Joaquín Av. Vicuña Mackenna 4860 Macul Santiago7820436 Chile Centro de Astroingeniería Facultad de Física Pontificia Universidad Católica de Chile Campus San Joaquín Av. Vicuña Mackenna 4860 Macul Santiago7820436 Chile Millennium Institute of Astrophysics Nuncio Monseñor Sótero Sanz 100 Of 104 Providencia Santiago Chile University of Ljubljana Department of Mathematics and Physics Jad

We present results of [C ii] 158 µm emission line observations, and report the spectroscopic redshift confirmation of a strongly lensed (µ ∼ 20) star-forming galaxy, MACS0308-zD1 at z = 6.2078 ±0.0002. The [C ii] emission line is detected with a signal-to-noise ratio > 6 within the rest-frame UV bright clump of the lensed galaxy (zD1.1) and exhibits multiple velocity components;the narrow [C ii] has a velocity full-width-half-maximum (FWHM) of 110 ± 20 km/s, while broader [C ii] is seen with an FWHM of 230 ± 20 km/s. The broader [C ii] component is blueshifted (−80 ± 20 km/s) with respect to the narrow [C ii] component, and has a morphology which extends beyond the UV-bright clump. We find that while the narrow [C ii] emission is most likely associated with zD1.1, the broader component is possibly associated with outflowing gas. Based on the non-detection of λ158 µm dust continuum, we find that MACS0308-zD1’s star-formation activity occurs in a dust-free environment with the stringent upper limit of infrared luminosity . 9 × 108 L•. Targeting this strongly lensed faint galaxy for followup ALMA and JWST observations will be crucial to characterize the details of typical galaxy growth in the early Universe. © 2023, CC BY.

关键词： Galaxies

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Author Correction: Human eye-inspired soft optoelectronic device using high-density MoS2-graphene curved image sensor array

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Nature communications 2022年第1期13卷 5170页

作者： Changsoon Choi Moon Kee Choi Siyi Liu Minsung Kim Ok Kyu Park Changkyun Im Jaemin Kim Xiaoliang Qin Gil Ju Lee Kyoung Won Cho Myungbin Kim Eehyung Joh Jongha Lee Donghee Son Seung-Hae Kwon Noo Li Jeon Young Min Song Nanshu Lu Dae-Hyeong Kim Center for Nanoparticle Research Institute for Basic Science (IBS) Seoul 08826 Republic of Korea. School of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University Seoul 08826 Republic of Korea. Center for Mechanics of Solids Structures and Materials Department of Aerospace Engineering and Engineering Mechanics University of Texas at Austin 210 E 24th St Austin TX 78712 USA. School of Mechanical and Aerospace Engineering Seoul National University Seoul 08826 Republic of Korea. Onfea Computing LLC 204 Jackson Street Newton MA 02459 USA. School of Electrical Engineering and Computer Science Gwangju Institute of Science and Technology Gwangju 61005 Republic of Korea. Division of Bio-imaging Korea Basic Science Institute Chun-Cheon 24341 Republic of Korea. Center for Mechanics of Solids Structures and Materials Department of Aerospace Engineering and Engineering Mechanics University of Texas at Austin 210 E 24th St Austin TX 78712 USA. nanshulu@utexas.edu. Department of Electrical and Computer Engineering Department of Biomedical Engineering Texas Materials Institute the University of Texas at Austin Austin TX 78712 USA. nanshulu@utexas.edu. Center for Nanoparticle Research Institute for Basic Science (IBS) Seoul 08826 Republic of Korea. dkim98@snu.ac.kr. School of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University Seoul 08826 Republic of Korea. dkim98@snu.ac.kr.

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Author Correction: A medium-range structure motif linking amorphous and crystalline states

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Nature materials 2022年第2期21卷 262页

作者： Si Lan Li Zhu Zhenduo Wu Lin Gu Qinghua Zhang Huihui Kong Jizi Liu Ruoyu Song Sinan Liu Gang Sha Yingang Wang Qi Liu Wei Liu Peiyi Wang Chain-Tsuan Liu Yang Ren Xun-Li Wang Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing China. lansi@***. Department of Physics City University of Hong Kong Kowloon Hong Kong China. lansi@***. College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing China. Center for Neutron Scattering and Applied Physics City University of Hong Kong Dongguan Research Institute Dongguan China. Beijing National Laboratory for Condensed Matter Physics and Collaborative Innovation Center of Quantum Matter Institute of Physics Chinese Academy of Sciences Beijing China. Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology Nanjing China. Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta GA USA. Department of Physics City University of Hong Kong Kowloon Hong Kong China. SUSTech Cryo-EM Facility Center Southern University of Science and Technology Shenzhen China. Center for Advanced Structural Materials & Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong China. X-ray Science Division Argonne National Laboratory Argonne IL USA. yren@anl.gov. Department of Physics City University of Hong Kong Kowloon Hong Kong China. xlwang@cityu.edu.hk. Center for Neutron Scattering City University of Hong Kong Shenzhen Research Institute Shenzhen China. xlwang@cityu.edu.hk.

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Building a pubmed knowledge graph

arXiv

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arXiv 2020年

作者： Xu, Jian Kim, Sunkyu Song, Min Jeong, Minbyul Kim, Donghyeon Kang, Jaewoo Rousseau, Justin F. Li, Xin Xu, Weijia Torvik, Vetle I. Bu, Yi Chen, Chongyan Ebeid, Islam Akef Li, Daifeng Ding, Ying School of Information Management Sun Yat-sen University Guangzhou China Department of Computer Science and Engineering Korea University Seoul Korea Republic of Department of Library and Information Science Yonsei University Seoul Korea Republic of Dell Medical School University of Texas AustinTX United States School of Information University of Texas AustinTX United States Texas Advanced Computing Center AustinTX United States School of Information Sciences University of Illinois ChampaignIL United States Center for Complex Networks and Systems Research Luddy School of Informatics Computing and Engineering Indiana University BloomingtonIN United States

PubMed®is an essential resource for the medical domain, but useful concepts are either difficult to extract or are ambiguated, which has significantly hindered knowledge discovery. To address this issue, we constructed a PubMed knowledge graph (PKG) by extracting bio-entities from 29 million PubMed abstracts, disambiguating author names, integrating funding data through the National Institutes of Health (NIH) ExPORTER, collecting affiliation history and educational background of authors from ORCID®, and identifying fine-grained affiliation data from MapAffil. Through the integration of the credible multi-source data, we could create connections among the bio-entities, authors, articles, affiliations, and funding. Data validation revealed that the BioBERT deep learning method of bio-entity extraction significantly outperformed the state-of-the-art models based on the F1 score (by 0.51%), with the author name disambiguation (AND) achieving a F1 score of 98.09%. PKG can trigger broader innovations, not only enabling us to measure scholarly impact, knowledge usage, and knowledge transfer, but also assisting us in profiling authors and organizations based on their connections with bio-entities. The PKG is freely available on Figshare (http://***/s/6327a55355fc2c99f3a2, simplified version that exclude PubMed raw data) and TACC website (http://***/datasets/ped, full version). Copyright © 2020, The Authors. All rights reserved.

关键词： Knowledge graph

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Nonsuperconducting electronic ground state in pressurized BaFe2S3 and BaFe2S2.5Se0.5

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Physical Review B 2020年第20期101卷 205129-205129页

作者： Hualei Sun Xiaodong Li Yazhou Zhou Jia Yu Benjamin A. Frandsen Shan Wu Zhijun Xu Sheng Jiang Qingzhen Huang Edith Bourret-Courchesne Liling Sun Jeffrey W. Lynn Robert J. Birgeneau Meng Wang School of Physics Sun Yat-Sen University Guangzhou Guangdong 510275 China Beijing Synchrotron Radiation Facility Institute of High Energy Physics Chinese Academy of Science Beijing 100049 China Institute of Physics and Beijing National Laboratory for Condensed Matter Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics and Astronomy Brigham Young University Provo Utah 84602 USA Materials Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics University of California Berkeley California 94720 USA NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland 20899 USA Department of Materials Science and Engineering University of Maryland College Park Maryland 20742 USA Shanghai Synchrotron Radiation Facility Zhangjiang Laboratory Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 China

We report a comprehensive study of the spin ladder compound BaFe2S2.5Se0.5 using neutron diffraction, inelastic neutron scattering, high pressure synchrotron diffraction, and high pressure transport techniques. We find that BaFe2S2.5Se0.5 possesses the same Cmcm structure and stripe antiferromagnetic order as does BaFe2S3, but with a reduced Néel temperature of TN=98 K compared to 120 K for the undoped system, and a slightly increased ordered moment of 1.40μB per iron. The low-energy spin excitations in BaFe2S2.5Se0.5 are likewise similar to those observed in BaFe2S3. However, unlike the reports of superconductivity in BaFe2S3 below Tc∼14 K under pressures of 10 GPa or more, we observe no superconductivity in BaFe2S2.5Se0.5 at any pressure up to 19.7 GPa. In contrast, the resistivity exhibits an upturn at low temperature under pressure. Furthermore, we show that additional high-quality samples of BaFe2S3 synthesized for this study likewise fail to become superconducting under pressure, instead displaying a similar upturn in resistivity at low temperature. These results demonstrate that microscopic, sample-specific details play an important role in determining the ultimate electronic ground state in this spin ladder system. We suggest that the upturn in resistivity at low temperature in both BaFe2S3 and BaFe2S2.5Se0.5 may result from Anderson localization induced by S vacancies and random Se substitutions, enhanced by the quasi-one-dimensional ladder structure.

关键词： Anderson localization Antiferromagnetism Exchange interaction Spin dynamics Spin fluctuations Antiferromagnets High-temperature superconductors Iron-based superconductors Crystal growth Crystal structures DC susceptibility measurements Inelastic neutron scattering Neutron diffraction Pressure techniques Resistivity measurements X-ray powder diffraction

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