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Nematic State inCeAuSb2
Physical Review X ( IF 12.211 ) Pub Date : 2020-02-13 , DOI: 10.1103/physrevx.10.011035
S. Seo, Xiaoyu Wang, S. M. Thomas, M. C. Rahn, D. Carmo, F. Ronning, E. D. Bauer, R. D. dos Reis, M. Janoschek, J. D. Thompson, R. M. Fernandes, and P. F. S. Rosa

At ambient pressure and zero field, tetragonal CeAuSb2 hosts stripe antiferromagnetic order at TN=6.3  K. Here, we first show via bulk thermodynamic probes and x-ray diffraction measurements that this magnetic order is connected with a structural phase transition to a superstructure that likely breaks C4 symmetry, thus signaling nematic order. The temperature-field-pressure phase diagram of CeAuSb2 subsequently reveals the emergence of additional ordered states under applied pressure at a multicritical point. Our phenomenological model supports the presence of a vestigial nematic phase in CeAuSb2 akin to iron-based high-temperature superconductors; however, superconductivity, if present, remains to be discovered.
更新日期:2020-02-13

 

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