Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe${}_2$

Abstract

The normal-conducting state of the superconductor UTe${}_2$ is studied by entropy analysis for magnetic fields along the $b$-axis, obtained from magnetization using the relation $(\partial M/\partial T{)}_B=(\partial S/\partial B{)}_T$. We observe a strong increase in entropy with magnetic field due to metamagnetic fluctuations (spatially uniform, $Q=0$). The field dependence is well described by the Hertz-Millis-Moriya theory for quantum criticality of itinerant metamagnetism. Notably, the lower bound of the quantum-critical region coincides well with the position of the minimum in the superconducting transition temperature $T_c(B)$. Hence, our results suggest that $Q=0$ fluctuations reinforce the superconductivity.

arXiv commentaccepted as a Letter in Phys. Rev. B

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Cited by in corpus (4)

• Enhanced triplet superconductivity in next generation ultraclean UTe2
• A quantum critical line bounds the high field metamagnetic transition surface in UTe${}_2$
• Intrinsic low-temperature magnetic properties on the ultra-clean UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K revealed by ${}^{125}$Te NMR
• Rotational Grüneisen ratio: a probe for quantum criticality in anisotropic systems