Effect of Applied Orthorhombic Lattice Distortion on the Antiferromagnetic Phase of CeAuSb${}_2$

Abstract

We study the response of the antiferromagnetism of CeAuSb${}_2$ to orthorhombic lattice distortion applied through in-plane uniaxial pressure. The response to pressure applied along a $⟨110⟩$ lattice direction shows a first-order transition at zero pressure, which shows that the magnetic order lifts the $(110)/(1\bar{1}0)$ symmetry of the unstressed lattice. Sufficient $⟨100⟩$ pressure appears to rotate the principal axes of the order from $⟨110⟩$ to $⟨100⟩$. At low $⟨100⟩$ pressure, the transition at $T_N$ is weakly first-order, however it becomes continuous above a threshold $⟨100⟩$ pressure. We discuss the possibility that this behavior is driven by order parameter fluctuations, with the restoration of a continuous transition a result of reducing the point-group symmetry of the lattice.

arXiv comment6 pages, 7 figures

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