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High-precision angle-resolved dc magnetization and magnetic torque studieswere performed on a single-crystalline sample of URhGe, an orthorhombic Isingferromagnet with the $c$ axis being the magnetization easy axis, in order toinvestigate the phase diagram around the ferromagnetic (FM) reorientationtransition in a magnetic field near the $b$ axis. We have clearly detectedfirst-order transition in both the magnetization and the magnetic torque at lowtemperatures, and determined detailed profiles of the wing structure of thethree-dimensional $T$-$H_{b}$-$H_{c}$ phase diagram, where $H_{c}$ and $H_{b}$denotes the field components along the $c$ and the $b$ axes, respectively. Thequantum wing critical points are located at $\mu_0H_c\sim\pm$1.1 T and$\mu_0H_b\sim$13.5 T. Two second-order transition lines at the boundaries ofthe wing planes rapidly tend to approach with each other with increasingtemperature up to $\sim 3$ K. Just at the zero conjugate field ($H_c=0$),however, a signature of the first-order transition can still be seen in thefield derivative of the magnetization at $\sim 4$ K, indicating that thetricritical point exists in a rather high temperature region above 4 K. Thisfeature of the wing plane structure is consistent with the theoreticalexpectation that three second-order transition lines merge tangentially at thetriciritical point.

physical review. b./physical review. b

Wing structure in the phase diagram of the Ising Ferromagnet URhGe close  to its tricritical point investigated by angle-resolved magnetization  measurements