Metamagnetic Transition in Heavy Fermion Superconductor UTe2

Abstract

We have studied the magnetization of the recently discovered heavy fermion superconductor UTe${}_2$ up to 56 T in pulsed-magnetic fields. A first-order metamagnetic transition has been clearly observed at $H_{\mathrm{m}}$ =34.9 T when the magnetic field $H$ is applied along the orthorhombic hard-magnetization $b$-axis. The transition has a critical end point at $\sim$11 K and 34.8 T, where the first order transition terminates and changes into a crossover regime. Using the thermodynamic Maxwell relation, we have evaluated the field dependence of the Sommerfeld coefficient of the specific heat directly related to the superconducting pairing. From the analysis, we found a significant enhancement of the effective mass centered at $H_{\mathrm{m}}$, which is reminiscent of the field-reentrant superconductivity of the ferromagnet URhGe in transverse fields. We discuss the origin of their field-robust superconductivity.

5 pages, 5 figures, accepted for publication in J. Phys. Soc. Jpn

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• A review of UTe${}_2$ at high magnetic fields
• Thermodynamic Investigation of Metamagnetism in Pulsed High Magnetic Fields on Heavy Fermion Superconductor UTe${}_2$
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• Enhanced triplet superconductivity in next generation ultraclean UTe2
• Slow Electronic Dynamics in the Paramagnetic State of UTe${}_2$
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• Pressure-induced structural phase transition and new superconducting phase in UTe2
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• Drastic change in magnetic anisotropy of UTe2 under pressure revealed by 125Te-NMR
• Multiple superconducting phases in heavy-fermion metals
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• On Sharp Enhancement of Effective Mass of Quasiparticles and Coefficient of T^{2} Term of Resistivity around First-Order Metamagnetic Transition Observed in UTe_{2}
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• Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$
• Violation of the orbital depairing limit in a non-unitary state --on the high field phase in the heavy Fermion superconductor UTe${}_2$--
• Theoretical studies on off-axis phase diagrams and Knight shifts in UTe${}_2$ -- Tetra-critical point, d-vector rotation, and multiple phases
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• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• Field-induced electric polarization and elastic softening caused by parity-mixed $d$-$p$ hybridized states with electric multipoles in Ba${}_2$CuGe${}_2$O${}_7$
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• Nature of quantum criticality in the Ising ferromagnet TbV${}_6$Sn${}_6$
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• Metamagnetic transition in the two $f$ orbitals Kondo lattice model
• Magnetic transitions induced by pressure and magnetic field in a two-orbital $5f$-electron model in cubic and tetragonal lattices
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• Anisotropic field response of specific heat for a ferromagnetic superconductor UCoGe in magnetic fields
• Metamagnetism and tricriticalilty in heavy-fermion ferromagnet URhGe
• Pressure-enhanced $f$-electron orbital weighting in UTe2 mapped by quantum interferometry