Abstract
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.
| Original language | English |
|---|---|
| Article number | 245121 |
| Journal | Physical Review B |
| Volume | 107 |
| Issue number | 24 |
| DOIs | |
| State | Published - Jun 15 2023 |
| Externally published | Yes |
Funding
This work was supported by the National Science Foundation (NSF) CAREER Award No. DMR-2045760. W.X. is supported by the Beckman Young Investigator Award. This research used resources of the Advanced Photon Source (APS), a U.S. Department of Energy (DOE) Office of Science User Facility operated for the U.S. DOE Office of Science by Argonne National Laboratory (ANL) under Contract No. DE-AC02-06CH11357. Portions of this work were performed at HPCAT (Sector 16), APS, ANL. HPCAT operations are supported by DOE-NNSA's Office of Experimental Sciences. Support from COMPRES under NSF Cooperative Agreement No. EAR-1606856 is acknowledged for the COMPRES-GSECARS gas loading system and the program. We thank W. Sturhahn for the helpful discussion on estimation of uncertainties in the conuss program.