In:
Chinese Physics B, IOP Publishing, Vol. 31, No. 7 ( 2022-07-01), p. 076201-
Abstract:
Topological materials have aroused great interest in recent years, especially when magnetism is involved. Pressure can effectively tune the topological states and possibly induce superconductivity. Here we report the high-pressure study of topological semimetals X Cd 2 Sb 2 ( X = Eu and Yb), which have the same crystal structure. In antiferromagnetic (AFM) Weyl semimetal EuCd 2 Sb 2 , the Néel temperature ( T N ) increases from 7.4 K at ambient pressure to 50.9 K at 14.9 GPa. When pressure is above 14.9 GPa, the AFM peak of resistance disappears, indicating a non-magnetic state. In paramagnetic Dirac semimetal candidate YbCd 2 Sb 2 , pressure-induced superconductivity appears at 1.94 GPa, then T c reaches to a maximum of 1.67 K at 5.22 GPa and drops to zero at about 30 GPa, displaying a dome-shaped temperature–pressure phase diagram. High-pressure x-ray diffraction measurement demonstrates that a crystalline-to-amorphous phase transition occurs at about 16 GPa in YbCd 2 Sb 2 , revealing the robustness of pressure-induced superconductivity against structural instability. Similar structural phase transition may also occur in EuCd 2 Sb 2 , causing the disappearance of magnetism. Our results show that X Cd 2 Sb 2 ( X = Eu and Yb) is a novel platform for exploring the interplay among magnetism, topology, and superconductivity.
Type of Medium:
Online Resource
ISSN:
1674-1056
DOI:
10.1088/1674-1056/ac7212
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2022
detail.hit.zdb_id:
2412147-2
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