Magnetic order in the van der Waals antiferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CrPS</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>: Anisotropic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>H</mml:mi><mml:mtext>−</mml:mtext><mml:mi>T</mml:mi></mml:math> phase diagrams and effects of pressure
Sergey L. Bud’ko, Elena Gati, Tyler J. Slade, P. C. Canfield
Abstract
Single crystalline samples of the van der Waals antiferromagnet ${\mathrm{CrPS}}_{4}$ were studied by measurements of specific heat and comprehensive anisotropic temperature- and magnetic-field-dependent magnetization. In addition, measurements of the heat capacity and magnetization were performed under pressures of up to $\ensuremath{\sim}21$ and $\ensuremath{\sim}14$ kbar, respectively. At ambient pressure, two magnetic transitions are observed: second order from a paramagnetic to an antiferromagnetic state at ${T}_{N}\ensuremath{\sim}37$ K, and a first-order spin reorientation transition at ${T}^{*}\ensuremath{\sim}34$ K. Anisotropic $H\text{\ensuremath{-}}T$ phase diagrams were constructed using the $M(T,H)$ data. As pressure is increased, ${T}_{N}$ is weakly suppressed with $d{T}_{N}/dP\ensuremath{\approx}\ensuremath{-}0.1$ K/kbar. ${T}^{*}$, on the other hand, is suppressed quite rapidly, with $d{T}^{*}/dP\ensuremath{\approx}\ensuremath{-}2$ K/kbar, extrapolating to a possible quantum phase transition at ${P}_{c}\ensuremath{\sim}15$ kbar.