Kavli Affiliate: Li Xin Li
| First 5 Authors: Zhenhai Yu1, Xuejiao Chen, Wei Xia, Ningning Wang, Xiaodong Lv
| Summary:
The rich nontrivial topological phases rooted in the interplay between
magnetism and topology in the layered antiferromagnet EuCd2As2 have captured
vast attention, especially the ideal Weyl semimetal state realized in the
spin-polarized ferromagnetic (FM) structure driven by a moderate external
magnetic field. In this work, combining high-pressure magnetotransport
measurements, structure chracterizations and first principles calculations, we
find that application of pressure can also realize the ideal Weyl state in
EuCd2As2 through driving the in-plane antiferromagnetic state across an
intermediate in-plane FM state then into the out-of-plane FM state. Our
high-pressure angle dispersive X-ray diffraction and X-ray absorption near-edge
spectroscopy measurements excluded structure transition and/or change of Eu2+
valence state as the sources for the magnetic phase transitions. Alternatively,
the apparently reduced axial ratio (c/a) and compressed Eu-layer space distance
should play important roles. Our result provides an alternative way to realize
the ideal Weyl semimetal state in EuCd2As2 and would be instructive for the
exploration of exotic topological properties in such layered magnetic
topological phase with strongly competing magnetic exchanges by using high
pressure.
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