Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$

Abstract

Metamagnetic transitions in the novel spin-triplet superconductor UTe${}_2$ were investigated through the newly developed simultaneous measurements of magnetization and sample temperature for the field along the orthorhombic $b$-axis and close to the [011] direction, where reentrant superconductivity (RSC) is detected below and above the first-order metamagnetic transition field $H_{\mathrm{m}}$. Combining the Maxwell's relation and the Clausius-Clapeyron equation, we obtained the field dependence of Sommerfeld coefficient $\gamma$ through the first-order metamagnetic transition. A significant enhancement of the effective mass toward $H_{\mathrm{m}}$ were detected for both field directions. On the other hand, above $H_{\mathrm{m}}$, the effective mass discontinuously decreases for $H||b$, while it discontinuously increases for $H||\sim [011]$, which seems to make a crucial role for the RSC.

arXiv comment8 pages, 11 figures, including supplemental material. To be published in Journal of Physical Society of Japan

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• Magnetic reshuffling and feedback on superconductivity in UTe2 under pressure
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• Pressure-induced structural phase transition and new superconducting phase in UTe2
• Magnetovolume Effect on the First-Order Metamagnetic Transition in UTe${}_2$
• Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe${}_2$
• c axis electrical transport at the metamagnetic transition in the heavy-fermion superconductor UTe2 under pressure
• A quantum critical line bounds the high field metamagnetic transition surface in UTe${}_2$
• Complex magnetic phase diagram with a small phase pocket in a three-dimensional frustrated magnet CuInCr${}_4$S${}_8$
• Isothermal and adiabatic magnetization processes of the spin-$\frac{1}{2}$ Heisenberg model on an anisotropic triangular lattice
• 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
• Field-angle evolution of the superconducting and magnetic phases of UTe${}_2$ around the $b$ axis
• Novel Easy-Axis Switching through Metamagnetism in CeSb${}_2$
• Field-induced electric polarization and elastic softening caused by parity-mixed $d$-$p$ hybridized states with electric multipoles in Ba${}_2$CuGe${}_2$O${}_7$
• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• Pauli 'unlimited': magnetic field induced-superconductivity in UTe${}_2$
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T