期刊
PHYSICAL REVIEW LETTERS
卷 123, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.027002
关键词
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资金
- J-Physics from JSPS [15H05883, 18H04306]
- KAKENHI from JSPS [19K14661, 17H01141, 18H01161, JP17K05553]
- NSFC of China [11822405, 11674157, 11674054, 11611140101]
- Grants-in-Aid for Scientific Research [18H01161, 19K14661] Funding Source: KAKEN
In the electronic nematic state, an electronic system has a lower symmetry than the crystal structure of the same system. Electronic nematic states have been observed in various unconventional superconductors such as cuprate, iron-based, heavy-fermion, and topological superconductors. The relation between nematicity and superconductivity is a major unsolved problem in condensed matter physics. By angle-resolved specific heat measurements, we report bulk quasiparticle evidence of nematicity in the topological superconductor SrxBi2Se3. The specific heat exhibited a clear twofold symmetry despite the threefold symmetric lattice. Most importantly, the twofold symmetry appeared in the normal state above the superconducting transition temperature. This is explained by the angle-dependent Zeeman effect due to the anisotropic density of states in the nematic phase. Such results highlight the interrelation between nematicity and unconventional superconductivity.
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