Quenched randomness, thermal fluctuations and reentrant superconductivity: application to UTe${}_2$

Abstract

Reentrant superconductivity has been observed in the candidate spin-triplet superconductor UTe${}_2$ as a function of the magnetic field applied along the hard axis. Resistivity measurements have shown, a broadened superconducting transition appears near the minimal $T_c$, highlighting the importance of superconducting fluctuations in this regime. We present a phenomenological study assuming a field-driven first-order transition between two superconducting states. We show that with quenched randomness, inhomogeneity-enhanced superconducting fluctuations near the transition could naturally account for both the reentrant superconductivity as well as the broadened superconducting transition.

Added superfluid stiffness result (Eq.7). References added. Updated Fig.4 with more sweeps

References in corpus (5)

• Unconventional Superconductivity in Heavy Fermion UTe2
• Metamagnetic Transition in Heavy Fermion Superconductor UTe2
• Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder UTe${}_2$
• Inhomogeneous Superconducting State Probed by ${}^{125}$Te NMR on UTe$_2
• Wing structure in the phase diagram of the Ising Ferromagnet URhGe close to its tricritical point investigated by angle-resolved magnetization measurements