Pressure-induced ferromagnetism in the topological semimetal
Abstract
The antiferromagnet and semimetal EuCd2As2 has recently attracted a lot of attention due to a wealth of topological phases arising from the interplay of topology and magnetism. In particular, the presence of a single pair of Weyl points is predicted for a ferromagnetic configuration of Eu spins along the c axis in EuCd2As2. In the search for such phases, we investigate here the effects of hydrostatic pressure in EuCd2As2. For that, we present specific heat, transport, and μSR measurements under hydrostatic pressure up to ~2.5GPa, combined with ab initio density functional theory (DFT) calculations. Experimentally, we establish that the ground state of EuCd2As2 changes from in-plane antiferromagnetic (AFMab) to ferromagnetic at a critical pressure of ≈2 GPa, which is likely characterized by the moments dominantly lying within the ab plane (FMab). The AFMab–FMab transition at such a relatively low pressure is supported by our DFT calculations. Furthermore, our theoretical results indicate that EuCd2As2 moves closer to the sought-for FMc state (moments ∥c) with increasing pressure further. We predict that a pressure of ≈23 GPa will stabilize the FMc state if Eu remains in a 2+ valence state. Thus, our work establishes hydrostatic pressure as a key tuning parameter that (i)more »
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1825566
- Alternate Identifier(s):
- OSTI ID: 1827086
- Report Number(s):
- IS-J-10,621
Journal ID: ISSN 2469-9950; PRBMDO; 155124
- Grant/Contract Number:
- DEAC02-07CH11358; AC02-07CH11358
- Resource Type:
- Published Article
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Name: Physical Review B Journal Volume: 104 Journal Issue: 15; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Antiferromagnetism; Ferromagnetism; Pressure effects; Specific heat; Transport phenomena; Weyl semimetal; DFT+U; Muon spin resonance
Citation Formats
Gati, Elena, Bud'ko, Sergey L., Wang, Lin-Lin, Valadkhani, Adrian, Gupta, Ritu, Kuthanazhi, Brinda, Xiang, Li, Wilde, John M., Sapkota, Aashish, Guguchia, Zurab, Khasanov, Rustem, Valentí, Roser, and Canfield, Paul C. Pressure-induced ferromagnetism in the topological semimetal Eu Cd 2 As 2. United States: N. p., 2021.
Web. doi:10.1103/PhysRevB.104.155124.
Gati, Elena, Bud'ko, Sergey L., Wang, Lin-Lin, Valadkhani, Adrian, Gupta, Ritu, Kuthanazhi, Brinda, Xiang, Li, Wilde, John M., Sapkota, Aashish, Guguchia, Zurab, Khasanov, Rustem, Valentí, Roser, & Canfield, Paul C. Pressure-induced ferromagnetism in the topological semimetal Eu Cd 2 As 2. United States. https://doi.org/10.1103/PhysRevB.104.155124
Gati, Elena, Bud'ko, Sergey L., Wang, Lin-Lin, Valadkhani, Adrian, Gupta, Ritu, Kuthanazhi, Brinda, Xiang, Li, Wilde, John M., Sapkota, Aashish, Guguchia, Zurab, Khasanov, Rustem, Valentí, Roser, and Canfield, Paul C. Wed .
"Pressure-induced ferromagnetism in the topological semimetal Eu Cd 2 As 2". United States. https://doi.org/10.1103/PhysRevB.104.155124.
@article{osti_1825566,
title = {Pressure-induced ferromagnetism in the topological semimetal Eu Cd 2 As 2},
author = {Gati, Elena and Bud'ko, Sergey L. and Wang, Lin-Lin and Valadkhani, Adrian and Gupta, Ritu and Kuthanazhi, Brinda and Xiang, Li and Wilde, John M. and Sapkota, Aashish and Guguchia, Zurab and Khasanov, Rustem and Valentí, Roser and Canfield, Paul C.},
abstractNote = {The antiferromagnet and semimetal EuCd2As2 has recently attracted a lot of attention due to a wealth of topological phases arising from the interplay of topology and magnetism. In particular, the presence of a single pair of Weyl points is predicted for a ferromagnetic configuration of Eu spins along the c axis in EuCd2As2. In the search for such phases, we investigate here the effects of hydrostatic pressure in EuCd2As2. For that, we present specific heat, transport, and μSR measurements under hydrostatic pressure up to ~2.5GPa, combined with ab initio density functional theory (DFT) calculations. Experimentally, we establish that the ground state of EuCd2As2 changes from in-plane antiferromagnetic (AFMab) to ferromagnetic at a critical pressure of ≈2 GPa, which is likely characterized by the moments dominantly lying within the ab plane (FMab). The AFMab–FMab transition at such a relatively low pressure is supported by our DFT calculations. Furthermore, our theoretical results indicate that EuCd2As2 moves closer to the sought-for FMc state (moments ∥c) with increasing pressure further. We predict that a pressure of ≈23 GPa will stabilize the FMc state if Eu remains in a 2+ valence state. Thus, our work establishes hydrostatic pressure as a key tuning parameter that (i) allows for a continuous tuning between magnetic ground states in a single sample of EuCd2As2 and (ii) enables the exploration of the interplay between magnetism and topology and thereby motivates a series of future experiments on this magnetic Weyl semimetal.},
doi = {10.1103/PhysRevB.104.155124},
journal = {Physical Review B},
number = 15,
volume = 104,
place = {United States},
year = {Wed Oct 13 00:00:00 EDT 2021},
month = {Wed Oct 13 00:00:00 EDT 2021}
}
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