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Phonon dynamics and magnetodielectric relaxation in distorted honeycomb ferrimagnet Ni4Nb2O9: Experiment and first-principles study

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Physical Review Materials 2025年第4期9卷 045202-045202页

作者： Harshita Singh Sobhit Singh Sayandeep Ghosh Prativa Pramanik Vasant Sathe Roland Mathieu Wilfrid Prellier Subhash Thota Department of Physics Indian Institute of Technology Guwahati Assam 781039 India Department of Mechanical Engineering University of Rochester Rochester New York 14627 USA Materials Science Program University of Rochester Rochester New York 14627 USA Department of Physics Chungnam National University Daejeon 34134 Republic of Korea Department of Physics Kunsan National University Gunsan 54150 Republic of Korea Department of Materials Science and Engineering Uppsala University Uppsala SE-75103 Sweden UGC DAE Consortium for Scientific Research Indore 452 001 India Laboratoire CRISMAT ENSICAEN CNRS Université de Caen Normandie Université Caen France

We present the experimental and theoretical studies of lattice dynamics, electronic structure, and magnetodielectric relaxation in the ferrimagnetic (FiM) Ni4Nb2O9. This system exhibits a distorted honeycomb lattice with the space group Pbcn (no. 60) and undergoes FiM ordering below 76 K (TFN), accompanied by a magnetic compensation at 33 K (TCOM). By employing density-functional theory (DFT+U) calculations and vibrational spectroscopy, we study all the allowed Raman and infrared phonon modes in Ni4Nb2O9. Temperature-dependent analysis of Raman-active phonon frequencies provides evidence of spin-phonon coupling in Ni4Nb2O9. Interestingly, we observe a nonlinear mode softening phenomenon in both frequencies ω(T) and their linewidths δωF(T), which can be described using three-phonon anharmonic processes. Contrary to the behavior of the remaining modes, 510 cm−1 mode shows a blue shift and effectively acts as a breathing mode for Ni atoms of two sublattices, and hence plays a crucial role in stabilizing the FiM ground state, thus explaining the strong sensitivity of this Ag mode to temperature. Our investigation of the temperature- and field-dependent relative dielectric permittivity and loss-tangent data reveals the absence of magnetodielectric coupling and the presence of dipole relaxation behavior in Ni4Nb2O9. Additionally, the theoretically determined indirect band gap is about 2.7 eV. Overall, our study helps to fill the existing knowledge gap and provides valuable insights into the electronic, vibrational, and magnetodielectric properties of Ni4Nb2O9, shedding light on its potential applications in dielectric-ceramic resonators and electrochemical sensors.

关键词： Local density approximation

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Constraints for the X17 boson from compacts objects observations

arXiv

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arXiv 2023年

作者： Kanakis-Pegios, A. Petousis, V. Veselský, M. Leja, Jozef Moustakidis, Charalampos C. Department of Theoretical Physics Aristotle University of Thessaloniki Thessaloniki54124 Greece Institute of Experimental and Applied Physics Czech Technical University Prague110 00 Czech Republic Faculty of Mechanical Engineering Slovak University of Technology in Bratislava Bratislava812 31 Slovakia

We investigate the hypothetical X17 boson on neutron stars and Quark Stars (QSs) using various hadronic Equation of States (EoSs) with phenomenological or microscopic origin. Our aim is to set realistic constraints on its coupling constant and the mass scaling, with respect to causality and various possible upper mass limits and the dimensionless tidal deformability Λ1.4. In particular, we pay special attention on two main phenomenological parameters of the X17, the one is related to the coupling constant g that it has with hadrons or quarks and the other with the in-medium effects through the regulator C. Both are very crucial concerning the contribution on the total energy density and pressure. In the case of considering the X17 as a carrier of nuclear force in Relativistic Mean Field (RMF) theory, an admixture into vector boson segment was constrained by 20% and 30%. In our investigation, we came to the general conclusion that the effect of the hypothetical X17 both on neutron and QSs constrained mainly by the causality limit, which is a specific property of each EoS. Moreover, it depends on the interplay between the main two parameters that is the interaction coupling g and the in-medium effects regulator C. These effects are more pronounced in the case of QSs concerning all the bulk properties. © 2023, CC BY.

关键词： Stars

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Theoretical study of the crystal structure of the bilayer nickel oxychloride Sr3Ni2O5Cl2 and analysis of possible unconventional superconductivity

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Physical Review B 2025年第6期111卷 064511-064511页

作者： Masayuki Ochi Hirofumi Sakakibara Hidetomo Usui Kazuhiko Kuroki Forefront Research Center Osaka University 1-1 Machikaneyama-cho Toyonaka Osaka 560-0043 Japan Department of Physics Osaka University 1-1 Machikaneyama-cho Toyonaka Osaka 560-0043 Japan Advanced Mechanical and Electronic System Research Center (AMES) Faculty of Engineering Tottori University 4-10 Koyama-cho Tottori Tottori 680-8552 Japan Department of Applied Physics Shimane University 1060 Nishikawatsu-cho Matsue Shimane 690-8504 Japan

The discovery of superconductivity under high pressure with Tc exceeding 80 K in a bilayer nickelate La3Ni2O7 has led to a strong desire to realize similar high Tc phenomena at ambient pressure. As one possible path toward realizing superconductivity at ambient pressure, we here propose to consider Sr3Ni2O5Cl2 as a possible candidate. In this study, we theoretically investigate the electronic structure of Sr3Ni2O5Cl2 and its structural stability. Our phonon calculation shows that this compound with the I4/mmm tetragonal structure is dynamically stable even at ambient pressure. The characteristic crystal field in this compound lowers the Ni−d3z2−r2 orbital energy, by which the Ni−d3z2−r2 orbital becomes rather closer to the half filling in Sr3Ni2O5Cl2 than La3Ni2O7. As a result, we find that superconductivity is enhanced even though a relatively strong orbital hybridization between the t2g and eg orbitals is somewhat detrimental for superconductivity. We also check the formation enthalpy, which shows that the high-pressure synthesis can be a good way to actually produce Sr3Ni2O5Cl2. We find that Sr3Ni2O5Cl2 is a promising new candidate of bilayer-nickelate superconductors, which can possess even higher Tc than pressurized La3Ni2O7, at ambient pressure.

关键词： Lanthanum compounds

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基于合成磁场的声学非互易

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Science Bulletin 2023年第19期68卷 2164-2169,M0003页

作者：陈召宪李正伟翁经锴梁彬陆延青程建春 Andrea Alù Collaborative Innovation Center of Advanced Microstructures Key Laboratory of Modern Acoustics of Ministry of EducationInstitute of AcousticsDepartment of PhysicsNanjing UniversityNanjing 210093China College of Engineering and Applied Sciences Nanjing UniversityNanjing 210093China Photonics Initiative Advanced Science Research CenterCity University of New YorkNew York NY 10031USA Physics Program Graduate CenterCity University of New YorkNew York NY 10016USA

通过设计特定的时空调制,合成磁性的概念最近被提出以实现对光子和声子等电荷中性粒子的非互易操控,但现有方案存在着隔离度低、信号频率变化等问题.本文设计了一种新型耦合共振腔系统,其中动态耦合的相位作为实现声学合成磁场的新机制... 详细信息

通过设计特定的时空调制,合成磁性的概念最近被提出以实现对光子和声子等电荷中性粒子的非互易操控,但现有方案存在着隔离度低、信号频率变化等问题.本文设计了一种新型耦合共振腔系统,其中动态耦合的相位作为实现声学合成磁场的新机制并打破了系统的时间反演对称性,最终取得了优异的声波非互易传输.基于旋转波近似方法,作者严格推导出了实现系统强非互易声传输的参数条件.通过优化动态耦合之间的相位差以及耦合强度,实验展示了隔离度达45-dB和正向传输率达0.85的优异单向声传输.此外,这种单向声传输具有始末态频率不变和隔离方向可电控等重要特性.该研究突破了现有声波单向操控机制在效率和隔离度方面的局限,并为实现弗洛奎和非线性声学拓扑绝缘体提供了新途径.

关键词：隔离度信号频率动态耦合非线性声学拓扑绝缘体耦合共振耦合强度声传输

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Enhanced magnetic and electrical properties of Ba2+ doped BiFeO3 multiferroic materials

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Ceramics International 2025年

作者： Sravani, G.M. Murali, N. Sekhar, B. Chandra Shanmukhi, P.S.V. Chohan, Jasgurpreet Singh Mammo, Tulu Wegayehu Parajuli, D. Batoo, Khalid Mujasam Ijaz, Muhammad Farzik Samatha, K. A. P. Visakhapatnam India Andhra University Visakhapatnam India Faculty of Allied Health Sciences Chettinad Hospital and Research Institute Chettinad Academy of Research and Education Tamil Nadu Kelambakkam603103 India Department of Physics Aditya College of Engineering and Technology Surampalem India University Centre for Research & Development Department of Mechanical Engineering Chandigarh University Gharuan Punjab Mohali India Department of Physics College of Natural and Computational Sciences Aksum University Axum Tigray Ethiopia Research Center for Applied Science and Technology Tribhuvan University Nepal King Abdullah Institute for Nanotechnology King Saud University P.O. Box-2455 Riyadh11451 Saudi Arabia Department of Mechanical Engineering College of Engineering King Saud University P. O. Box-800 Riyadh11421 Saudi Arabia Department of Physics Andhra University A. P. Visakhapatnam India

This study investigates the structural, morphological, magnetic, and electrical properties of sol-gel auto-combusted Bi1-xBaxFeO3 (x = 0.00, 0.05, 0.10, 0.15, 0.20, and 0.25) multiferroics using XRD, FESEM, VSM, and LCR methods. The samples exhibit rhombohedral spinel crystal structures in the R3c space group, confirmed by vibrational spectra of Fe–O bonds at approximately 450–465 cm−1 and 560–582 cm−1. FESEM micrographs reveal that the materials are spherical, tightly packed, and have minimal porosity. Saturation magnetization increases in Ba-doped samples, ranging from 1.45 emu/g to 2.49 emu/g at 20 kOe. The Cole-Cole plots display broader semicircles and increased frequency shifts (10 Hz–1 MHz), indicating enhanced granularity and improved grain boundary characteristics. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Nanocrystals

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Development of a Speed-Limiting Braking Mechanism for Baby Walkers Using a PI Controller

Development of a Speed-Limiting Braking Mechanism for Baby W...

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Smart Mechatronics (ICSMech), IEEE International Conference on

作者： Islamiyati Islamiyati Riza Muhida Muhammad Riza Arko Djajadi Sadiman Sadiman Yoga Tri Wijayanti Kusumawardhany Airlangga Rijanti Huminsa Ranto Morison Panjaitan Dandi Efendi Program Studi Kebidanan Metro Poltekkes Kemenkes Tanjung Karang Lampung Indonesia Department of Mechanical Engineering Universitas Bandar Lampung Bandar Lampung Indonesia Department of Engineering Physics Universitas Multimedia Nusantara Tangerang Banten Indonesia RSUD Jendral A. Yani Metro Lampung Indonesia RSUD Sukadana Lampung Timur Indonesia

ISBN: (数字)9798350368918

ISBN: (纸本)9798350368925

Baby walkers are commonly used to support infants in developing motor skills and walking abilities, yet their uncontrolled movement poses significant safety risks, such as falls and injuries. This study addresses these risks by developing a speed-limiting braking system that prevents baby walkers from exceeding a safe speed limit of 0.3 meters per second, thereby enhancing safety. The system integrates a Proportional-Integral (PI) controller, a speed sensor, and a servo motor-driven braking mechanism. Methodology involved MATLAB simulations to fine-tune controller parameters and physical testing for validation. Results showed the braking mechanism engaged promptly when the speed limit was reached and disengaged when speed decreased, confirming effective regulation without impeding natural infant movements. This study demonstrates a reliable solution to enhance baby walker safety while promoting safe motor development for infants. MATLAB simulations and physical tests confirmed the system's efficiency in real-time speed monitoring and automated braking. The results highlighted rapid response times and seamless braking, providing controlled deceleration without interfering with the infant's natural movements.

关键词： Pediatrics PI control Real-time systems Safety Time factors Reliability MATLAB Servomotors Monitoring Testing

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Life Cycle Assessment of the Charge Carrier Mediated Electrocatalytic Reduction of Carbon Dioxide to Formic Acid

SSRN

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SSRN 2024年

作者： Matin, Naser S. Moreno, Daniel A. Abad, Keemia Omosebi, Ayo Liu, Kunlei Thompson, Jesse Center for Applied Energy Research University of Kentucky 2540 Research Park Drive LexingtonKY40511 United States University of Kentucky Department of Chemistry LexingtonKY40506 United States Cooperative Engineering Program Missouri State University United States University of Kentucky Department of Mechanical Engineering LexingtonKY40506 United States

A cradle-to-gate prospective life cycle assessment (LCA) was conducted to investigate the environmental ramifications of a recently developed process to convert CO2 to formic acid through a unique charge carrier mediated electrocatalytic (IEC-FA) approach. According to the results of this study, CO2, and sulfuric acid (H2SO4) and the electricity used to drive the CO2 reduction reaction are main environmental hot spots in the overall process in terms of global warming potential (GWP). The charge carrier mediated electrocatalytic reduction process shows a GWP of 1.02 kgCO2eq per kg formic acid produced. The LCA analysis was performed using TRACI 2.1, ReCipe 2016 Midpoint (H), and ecoinvent - cumulative energy demand methods. The sensitivity and uncertainty analysis were performed to find a potential breakeven point i.e., kgCO2eq per kg formic acid ≤ 1, for the IEC-FA process. However, using renewable energies for the IEC-FA process can make the process carbon footprint negative. The IEC-FA process was also compared with the conventional methyl formate hydrolysis regarding its environmental impacts. A scenario analysis over the main environmental contributors including carbon dioxide, sulfuric acid, and electricity source in terms of their impact on the LCA results is also presented. © 2024, The Authors. All rights reserved.

关键词： Carbon dioxide

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Statistical Mechanics of Thermostatically Controlled Multi-Zone Buildings

arXiv

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arXiv 2022年

作者： Valenzuela, Lucas Fuentes Williams, Lindell Chertkov, Michael Department of Electrical Engineering Stanford University United States Department of Physics Cornell University United States Program in Applied Mathematics & Department of Mathematics University of Arizona United States

We study the collective phenomena and constraints associated with the aggregation of individual cooling units from a statistical mechanics perspective. These units are modelled as Thermostatically Controlled Loads (TCLs) and represent zones in a large commercial or residential building. Their energy input is centralized and controlled by a collective unit – the Air Handling Unit (AHU) — delivering cool air to all TCLs, thereby coupling them together. Aiming to identify representative qualitative features of the AHU-to-TCL coupling, we build a realistic but also sufficiently simple model and analyze it in two distinct regimes: the Constant Supply Temperature (CST) and the Constant Power Input (CPI) regimes. In both cases, we center our analysis on the relaxation dynamics of individual TCL temperatures to a statistically steady state. We observe that while the dynamics are relatively fast in the CST regime, resulting in all TCLs evolving around the control setpoint, the CPI regime reveals emergence of a bi-modal probability distribution and two, possibly strongly separated, time scales. We observe that the two modes in the CPI regime are associated with all TCLs being in the same low and high-temperature states, respectively, with occasional (and therefore possibly rare) collective transition between the modes akin in the Kramer’s phenomenon of statistical physics. To the best of our knowledge, this phenomenon was overlooked in the context of the multi-zone energy building engineering, even thought it has direct implications on the operations of centralized cooling systems in buildings. It teaches us that a balance needs to be struck between occupational comfort — related to variations in the individual temperatures — and power output predictability — the main focus of the DR schemes. © 2022, CC BY.

关键词： Statistical mechanics

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Title: Robust Super-Moiré in Large Angle Single-Twist Bilayers

arXiv

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arXiv 2025年

作者： Li, Yanxing Shi, Chuqiao Zhang, Fan Liu, Xiaohui Xue, Yuan Ha, Viet-Anh Gao, Qiang Dong, Chengye Lin, Yu-Chuan Holtsman, Luke N. Morales-Durán, Nicolas Kim, Hyunsue Jiang, Yi Holbrook, Madisen Hone, James Barmak, Katayun Robinson, Joshua Li, Xiaoqin Giustino, Feliciano Khalaf, Eslam Han, Yimo Shih, Chih-Kang Department of Physics The University of Texas at Austin AustinTX United States Department of Materials Science and NanoEngineering Rice University HoustonTX United States Department of Physics Harvard University CambridgeMA United States Oden Institute for Computational Engineering and Sciences The University of Texas at Austin AustinTX United States Department of Materials Science and Engineering Pennsylvania State University University ParkPA United States Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu Taiwan Department of Applied Physics and Applied Mathematics Columbia University New York CityNY United States Advanced Photon Source Argonne National Laboratory LemontIL United States Department of Mechanical Engineering Columbia University New York CityNY United States

Forming long wavelength moiré superlattices (MSL) at small-angle twist van der Waals (vdW) bilayers has been a key approach to creating moiré flat bands1–8. The small-angle twist, however, leads to strong lattice reconstruction, causing domain walls and moiré disorders, which pose considerable challenges in engineering such platforms6–10. At large twist angles, the rigid lattices render a more robust, but shorter wavelength MSL, making it difficult to engineer flat bands. Here, we depict a novel approach to tailoring robust super-moiré (SM) structures that combines the advantages of both small-twist and large-twist transition metal dichalcogenides (TMDs) bilayers using only a single twist angle near a commensurate angle. Structurally, we unveil the spontaneous formation of a periodic arrangement of three inequivalent commensurate moiré (CM) stacking, where the angle deviation from the commensurate angle can tune the periodicity. Electronically, we reveal a large set of van Hove singularities (VHSs) that indicate strong band hybridization, leading to flat bands near the valence band maximum. Our study paves the way for a new platform of robust SM bilayers with structural rigidity and controllable wavelength, extending the investigation of the interplay among band topology, quantum geometry, and moiré superconductivity to the large twist angle regime. Copyright © 2025, The Authors. All rights reserved.

关键词： Van der Waals forces

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Technology Roadmap for Flexible Sensors

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ACS NANO 2023年第6期17卷 5211-5295页

作者： Luo, Yifei Abidian, Mohammad Reza Ahn, Jong-Hyun Akinwande, Deji Andrews, Anne M. Antonietti, Markus Bao, Zhenan Berggren, Magnus Berkey, Christopher A. Bettinger, Christopher John Chen, Jun Chen, Peng Cheng, Wenlong Cheng, Xu Choi, Seon-Jin Chortos, Alex Dagdeviren, Canan Dauskardt, Reinhold H. Di, Chong-an Dickey, Michael D. Duan, Xiangfeng Facchetti, Antonio Fan, Zhiyong Fang, Yin Feng, Jianyou Feng, Xue Gao, Huajian Gao, Wei Gong, Xiwen Guo, Chuan Fei Guo, Xiaojun Hartel, Martin C. He, Zihan Ho, John S. Hu, Youfan Huang, Qiyao Huang, Yu Huo, Fengwei Hussain, Muhammad M. Javey, Ali Jeong, Unyong Jiang, Chen Jiang, Xingyu Kang, Jiheong Karnaushenko, Daniil Khademhosseini, Ali Kim, Dae-Hyeong Kim, Il-Doo Kireev, Dmitry Kong, Lingxuan Lee, Chengkuo Lee, Nae-Eung Lee, Pooi See Lee, Tae-Woo Li, Fengyu Li, Jinxing Liang, Cuiyuan Lim, Chwee Teck Lin, Yuanjing Lipomi, Darren J. Liu, Jia Liu, Kai Liu, Nan Liu, Ren Liu, Yuxin Liu, Yuxuan Liu, Zhiyuan Liu, Zhuangjian Loh, Xian Jun Lu, Nanshu Lv, Zhisheng Magdassi, Shlomo Malliaras, George G. Matsuhisa, Naoji Nathan, Arokia Niu, Simiao Pan, Jieming Pang, Changhyun Pei, Qibing Peng, Huisheng Qi, Dianpeng Ren, Huaying Rogers, John A. Rowe, Aaron Schmidt, Oliver G. Sekitani, Tsuyoshi Seo, Dae-Gyo Shen, Guozhen Sheng, Xing Shi, Qiongfeng Someya, Takao Song, Yanlin Stavrinidou, Eleni Su, Meng Sun, Xuemei Takei, Kuniharu Tao, Xiao-Ming Tee, Benjamin C. K. Thean, Aaron Voon-Yew Trung, Tran Quang Wan, Changjin Wang, Huiliang Wang, Joseph Wang, Ming Wang, Sihong Wang, Ting Wang, Zhong Lin Weiss, Paul S. Wen, Hanqi Xu, Sheng Xu, Tailin Yan, Hongping Yan, Xuzhou Yang, Hui Yang, Le Yang, Shuaijian Yin, Lan Yu, Cunjiang Yu, Guihua Yu, Jing Yu, Shu-Hong Yu, Xinge Zamburg, Evgeny Zhang, Haixia Zhang, Xiangyu Zhang, Xiaosheng Zhang, Xueji Zhang, Yihui Zhang, Yu Zhao, Siyuan Zhao, Xuanhe Zheng, Yuanjin Zheng, Yu-Qing Zheng, Zijian Zhou, Tao Zhu, Bowen Zhu, Ming Zhu, Rong Zhu, Yangzhi Zhu, Yong Zou, Guijin Chen, Xiaodong Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (A*STAR) 2 Fusionopolis Way #08-03 Innovis Singapore 138634 Republic of Singapore；Innovative Centre for Flexible Devices (iFLEX) School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore Department of Biomedical Engineering University of Houston Houston Texas 77024 United States School of Electrical and Electronic Engineering Yonsei University Seoul 03722 Republic of Korea Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 United States；Microelectronics Research Center The University of Texas at Austin Austin Texas 78758 United States Department of Chemistry and Biochemistry California NanoSystems Institute and Department of Psychiatry and Biobehavioral Sciences Semel Institute for Neuroscience and Human Behavior and Hatos Center for Neuropharmacology University of California Los Angeles Los Angeles California 90095 United States Colloid Chemistry Department Max Planck Institute of Colloids and Interfaces 14476 Potsdam Germany Department of Chemical Engineering Stanford University Stanford California 94305 United States Laboratory of Organic Electronics Department of Science and Technology Campus Norrköping Linköping University 83 Linköping Sweden；Wallenberg Initiative Materials Science for Sustainability (WISE) and Wallenberg Wood Science Center (WWSC) SE-100 44 Stockholm Sweden Department of Materials Science and Engineering Stanford University Stanford California 94301 United States Department of Biomedical Engineering and Department of Materials Science and Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 United States Department of Bioengineering University of California Los Angeles Los Angeles California 90095 United States School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University Singapore 637457

Humans rely increasingly on sensors to address grand challenges and to improve quality of life in the era of digitalization and big data. For ubiquitous sensing, flexible sensors are developed to overcome the limitations of conventional rigid counterparts. Despite rapid advancement in bench-side research over the last decade, the market adoption of flexible sensors remains limited. To ease and to expedite their deployment, here, we identify bottlenecks hindering the maturation of flexible sensors and propose promising solutions. We first analyze continued...challenges in achieving satisfactory sensing performance for real-world applications and then summarize issues in compatible sensor-biology interfaces, followed by brief discussions on powering and connecting sensor networks. Issues en route to commercialization and for sustainable growth of the sector are also analyzed, highlighting environmental concerns and emphasizing nontechnical issues such as business, regulatory, and ethical considerations. Additionally, we look at future intelligent flexible sensors. In proposing a comprehensive roadmap, we hope to steer research efforts towards common goals and to guide coordinated development strategies from disparate communities. Through such collaborative

关键词： soft materials mechanics engineering flexible electronics conformable sensors bioelectronics human-machine interfaces body area sensor networks technology translation sustainable electronics

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