Nematic State in CeAuSb2

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Abstract

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.

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Seo, S., Wang, X., Thomas, S. M., Rahn, M. C., Carmo, D., Ronning, F., … Rosa, P. F. S. (2020). Nematic State in CeAuSb2. Physical Review X, 10(1). https://doi.org/10.1103/PhysRevX.10.011035

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