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.

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

References in corpus (10)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Tricritical point and wing structure in the itinerant ferromagnet UGe2
• Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe
• Sharp magnetization jump at the first-order superconducting transition in Sr2RuO4
• Collapse of ferromagnetism and Fermi surface instability near reentrant superconductivity of URhGe
• Unconventional Strong Spin-Fluctuation Effects around the Critical Pressure of the Itinerant Ising-Type Ferromagnet URhAl
• Reentrant superconductivity in URhGe
• Third law of thermodynamics and the shape of the phase diagram for systems with a first-order quantum phase transition
• Pressure-induced quantum phase transition in the itinerant ferromagnet UCoGa
• Constraints on the merging of the transition lines at the tricritical point in a wing-structure phase diagram

Cited by in corpus (11)

• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Thermodynamic Investigation of Metamagnetism in Pulsed High Magnetic Fields on Heavy Fermion Superconductor UTe${}_2$
• Quantum tricritical point in the temperature-pressure-magnetic field phase diagram of CeTiGe${}_3$
• Non-unitary triplet superconductivity tuned by field-controlled magnetization --URhGe, UCoGe and UTe${}_2$--
• Anomalous Anisotropy of the Lower Critical Field and Meissner Effect in UTe2
• Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe${}_2$
• 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${}_2$
• Anisotropic field response of specific heat for a ferromagnetic superconductor UCoGe in magnetic fields
• Metamagnetism and tricriticalilty in heavy-fermion ferromagnet URhGe