Pressure-induced ferromagnetism in the topological semimetal EuCd2As2 Gati, Elean 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
dc.contributor.department Physics and Astronomy
dc.contributor.department Ames Laboratory 2022-04-29T16:15:54Z 2022-04-29T16:15:54Z 2021-10-13
dc.description.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 ∼2.5 GPa, 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.
dc.description.comments This article is published as Gati, Elena, Sergey L. Bud'ko, Lin-Lin Wang, Adrian Valadkhani, Ritu Gupta, Brinda Kuthanazhi, Li Xiang et al. "Pressure-induced ferromagnetism in the topological semimetal Eu Cd 2 As 2." Physical Review B 104, no. 15 (2021): 155124. DOI: 10.1103/PhysRevB.104.155124. Copyright 2022 American Physical Society. Attribution 4.0 International (CC BY 4.0). DOE Contract Number(s): AC02-07CH11358; AC02-07CH11358. Posted with permission.
dc.identifier.other 1825566
dc.identifier.other 1827086
dc.language.iso en
dc.publisher Iowa State University Digital Repository, Ames IA (United States)
dc.relation.ispartofseries IS-J 10621
dc.source.uri *
dc.title Pressure-induced ferromagnetism in the topological semimetal EuCd2As2
dc.type Article
dspace.entity.type Publication
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relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
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