Evolution of magnetism, valence, and crystal lattice in EuCd2As2 under pressure

Jose, Greeshma C.; Burrage, Kaleb; Gonzalez Jimenez, Jose L.; Xie, Weiwei; Lavina, Barbara; Zhao, Jiyong; Alp, Esen E.; Zhang, Dongzhou; Xiao, Yuming; Vohra, Yogesh K.; Bi, Wenli

doi:10.1103/physrevb.107.245121

Evolution of magnetism, valence, and crystal lattice in EuCd₂As₂ under pressure

Journal Article · Mon Jun 12 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.245121· OSTI ID:1985912

^[1]; Burrage, Kaleb ^[1]; ^[2]; Xie, Weiwei ^[2]; ^[3]; Zhao, Jiyong ^[4]; Alp, Esen E. ^[4]; Zhang, Dongzhou ^[5]; Xiao, Yuming ^[6]; Vohra, Yogesh K. ^[1]; ^[1]

Univ. of Alabama, Birmingham, AL (United States)
Michigan State Univ., East Lansing, MI (United States)
Univ. of Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States)

EuCd₂As₂ has been proposed to be one of the ideal platforms as an intrinsic topological magnetic system, potentially hosting a single pair of Weyl points when it is tuned into the ferromagnetic state with spins aligned out of plane by either external pressure or chemical doping. To investigate the possible realization of an ideal topological state, we have systematically investigated pressure control of the magnetic state, valence, and crystal structure using synchrotron-based time-domain Mössbauer spectroscopy, x-ray absorption spectroscopy, and powder x-ray diffraction. Our experimental results show that the magnetic configuration remains mostly in plane under pressure up to 42.8 GPa and pressure effectively enhances the magnetic ordering temperature. Meanwhile, Eu ions remain divalent when subjected to pressure up to 35.9 GPa, and the trigonal crystal lattice is maintained up to 34.6 GPa. Our work provides valuable experimental data to benchmark future theoretical studies in magnetic topological materials.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: Consortium for Materials Properties Research in Earth Sciences (COMPRES); National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1985912

Alternate ID(s):: OSTI ID: 1984724

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 24 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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