Coexistence of charge density wave and field-tuned magnetic states in TmNiC2

作     者：Kamil K. Kolincio Marta Roman Valerio Tammurello Simone Di Cataldo Daniel Matulka Sonia Francoual Berthold Stöger Herwig Michor 

作者机构：Faculty of Applied Physics and Mathematics Gdańsk University of Technology Narutowicza 11/12 80-233 Gdańsk Poland Institute of Solid State Physics TU Wien Wiedner Hauptstrasse 8–10 A-1040 Wien Austria Institute of Physics and Applied Computer Science Faculty of Applied Physics and Mathematics Gdańsk University of Technology Narutowicza 11/12 80-233 Gdańsk Poland Dipartimento di Fisica Sapienza University of Rome Piazzale Aldo Moro 5 00185 Rome Italy X-Ray Center TU Wien Getreidemarkt 9 A-1060 Wien Austria Deutsches Elektronen-Synchrotron DESY 22607 Hamburg Germany 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2025年第111卷第24期

页      面：245116-245116页

基　　金：European Commission, EC Narodowa Agencja Wymiany Akademickiej, NAWA, (PPN/BAT/2021/1/00016) Narodowa Agencja Wymiany Akademickiej, NAWA Austrian Academic Exchange Service ÖAD, (PL04/2022, BPN/BEK/2021/1/00245/DEC/1) Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR, (CUP C93C22005230007, 1561, PE000021) Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR 

主　　题：Charge density waves 

摘      要：Exploring the relations between coexisting, cooperative, or competing types of ordering is a key to identify and harness the mechanisms governing the mutual interactions between them and to utilize their combined properties. We have experimentally explored the response of the charge density wave (CDW) to various antiferromagnetic, metamagnetic, and field-aligned ferromagnetic states that constitute the magnetic phase diagram of TmNiC2. The high-resolution x-ray diffraction experiment employing synchrotron radiation at low temperature and high magnetic field allowed one to follow the superstructure satellite reflections, being a sensitive probe of CDW. This investigation not only reveals direct evidence that the charge density wave avoids even a partial suppression in the antiferromagnetic ground state, but also proves that this state coexists, without any visible signatures of weakening, in the entire dome of the magnetically ordered phases, including the field-aligned ferromagnetic state. The calculations of the electronic and phonon structures support the experiment, revealing that the dominant contribution to the CDW transition stems from momentum-dependent electron-phonon coupling. We conclude that this mechanism prevents the CDW from vanishing, although the nesting conditions within the magnetically ordered phases deteriorate.