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

Abstract

High-precision angle-resolved dc magnetization and magnetic torque studies were performed on a single-crystalline sample of URhGe, an orthorhombic Ising ferromagnet with the $c$ axis being the magnetization easy axis, in order to investigate the phase diagram around the ferromagnetic (FM) reorientation transition in a magnetic field near the $b$ axis. We have clearly detected first-order transition in both the magnetization and the magnetic torque at low temperatures, and determined detailed profiles of the wing structure of the three-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. The quantum wing critical points are located at ${\mu }_0{H}_c\sim \pm$1.1 T and ${\mu }_0{H}_b\sim$13.5 T. Two second-order transition lines at the boundaries of the wing planes rapidly tend to approach with each other with increasing temperature 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 the field derivative of the magnetization at $\sim 4$ K, indicating that the tricritical point exists in a rather high temperature region above 4 K. This feature of the wing plane structure is consistent with the theoretical expectation that three second-order transition lines merge tangentially at the triciritical point.

arXiv comment10 pages, 11 figures, accepted for publication in Phys. Rev. B

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• Field-rotational magnetocaloric effect: A new experimental technique for accurate measurement of the anisotropic magnetic entropy
• Metamagnetic phase transition in ferromagnetic superconductor URhGe
• Violation of the orbital depairing limit in a non-unitary state --on the high field phase in the heavy Fermion superconductor UTe${}_2$--
• Quenched randomness, thermal fluctuations and reentrant superconductivity: application to UTe${}_2$
• Field-angular Dependence of Pairing Interaction in URhGe: Comparison with UCoGe
• Metamagnetism and tricriticalilty in heavy-fermion ferromagnet URhGe
• Anisotropic field response of specific heat for a ferromagnetic superconductor UCoGe in magnetic fields