Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe${}_2$

Abstract

The potential spin-triplet heavy-fermion superconductor UTe${}_2$ exhibits signatures of multiple distinct superconducting phases. For field aligned along the $b$ axis, a metamagnetic transition occurs at ${\mu }_0{H}_{\mathrm{m}}\approx 35$T. It is associated with magnetic fluctuations that may be beneficial for the field-reinforced superconductivity surviving up to $H_{\mathrm{m}}$. Once the field is tilted away from the $b$ towards the $c$ axis, a reentrant superconducting phase emerges just above $H_{\mathrm{m}}$. In order to better understand this remarkably field-resistant superconducting phase, we conducted magnetic-torque and magnetotransport measurements in pulsed magnetic fields. We determine the record-breaking upper critical field of ${\mu }_0{H}_{c2}\approx 73$T and its evolution with angle. Furthermore, the normal-state Hall effect experiences a drastic suppression indicative of a reduced band polarization above $H_{\mathrm{m}}$ in the angular range around $30^{\circ }$ caused by a partial compensation between the applied field and an exchange field. This promotes the Jaccarino-Peter effect as a likely mechanism for the reentrant superconductivity above $H_{\mathrm{m}}$.

arXiv commentMain text: 29 pages, 4 figure; Supplement: 12 pages, 6 figures

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• Theoretical studies on off-axis phase diagrams and Knight shifts in UTe${}_2$ -- Tetra-critical point, d-vector rotation, and multiple phases
• Spin caloritronics as a probe of nonunitary superconductors
• Magnetic signatures of pressure-induced multicomponent superconductivity in UTe${}_2$
• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$
• Slow magnetic quantum oscillations in the c-axis magnetoresistance of UTe${}_2$
• Pauli 'unlimited': magnetic field induced-superconductivity in UTe${}_2$
• Pressure-enhanced $f$-electron orbital weighting in UTe2 mapped by quantum interferometry
• Electronic correlations and topology in Kondo insulator PuB${}_6$
• Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T