At ambient pressure and zero field, tetragonal CeAuSb${}_2$ hosts stripe antiferromagnetic order at $T_N=6.3$~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 which likely breaks $C_4$ symmetry, thus signaling nematic order. The temperature-field-pressure phase diagram of CeAuSb${}_2$ 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 CeAuSb${}_2$ akin to iron-based high-temperature superconductors; however, superconductivity, if present, remains to be discovered.

中文翻译：

---

CeAuSb2中的向列状态

在环境压力和零场下，四方CeAuSb${}_{\mathrm{2个}}$ 主机在以下条带反铁磁命令 ${Ť}_{ñ}=6.3$〜K。在这里，我们首先通过大体积热力学探针和X射线衍射测量表明，这种磁阶与结构相变连接到可能破坏的上层结构有关$C_4$对称，从而发出向列顺序的信号。CeAuSb的温度场-压力相图${}_{\mathrm{2个}}$随后揭示了在多临界点施加压力下其他有序状态的出现。我们的现象学模型支持CeAuSb中存在残留向列相${}_{\mathrm{2个}}$类似于铁基高温超导体；但是，如果存在超导性，还有待发现。