Boosted magnetic fluctuations at the onset of superconductivity in UTe${}_2$ beyond 40 T

Abstract

Several unconventional superconducting phases have been discovered close to a metamagnetic transition in the heavy-fermion compound UTe${}_2$. Although suspected to be of magnetic nature, the mechanisms stabilizing these superconducting phases remain mysterious. Here, we present electrical-resistivity measurements on UTe${}_2$, with a current $\mathbf{I}\parallel \mathbf{a}$ and under pulsed magnetic fields up to 60~T rotating in the ($\mathbf{b}$,$\mathbf{c}$) plane. We find that the maximum of the Fermi-liquid coefficient $A$ at the metamagnetic transition is enhanced under magnetic fields tilted by $30-40{}^{\circ }$ from $\mathbf{b}$ to $\mathbf{c}$. The enhancement of $A$ coincides with the stabilization of superconductivity in the polarized paramagnetic regime beyond the metamagnetic field ${\mu }_0{H}_m\gtrsim 40$~T. It is the signature of a boosted quantum-critical magnetic-fluctuation mode probably in play for the mechanism of this superconducting phase. This result appeals for descriptions of the interplay between magnetic-field-induced superconductivity and quantum critical magnetic properties.

8 pages, 4 Figures + Supplemental Material with 21 pages, 18 Figures

References in corpus (39)

• Unconventional Superconductivity in Heavy Fermion UTe2
• Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe
• Metamagnetic Transition in Heavy Fermion Superconductor UTe2
• Incommensurate Spin Fluctuations in the Spin-triplet Superconductor Candidate UTe${}_2$
• 125Te-NMR Study on a Single Crystal of Heavy Fermion Superconductor UTe2
• First Observation of de Haas-van Alphen Effect and Fermi Surfaces in Unconventional Superconductor UTe2
• Low-dimensional antiferromagnetic fluctuations in the heavy-fermion paramagnetic ladder UTe${}_2$
• Antiferromagnetic criticality at a heavy-fermion quantum phase transition
• Resonance from antiferromagnetic spin fluctuations for superconductivity in UTe${}_2$
• Field-induced tuning of the pairing state in a superconductor
• Magnetic-Field-Induced Phenomena in the Paramagnetic Superconductor UTe${}_2$
• Field Re-entrant Superconductivity Induced by the Enhancement of Effective Mass in URhGe
• Comparison of two superconducting phases induced by a magnetic field in UTe2
• Quasi-2D Fermi surface in the anomalous superconductor UTe2
• $c$-axis transport in UTe${}_2$: Evidence of Three Dimensional Conductivity Component
• Thermodynamic Investigation of Metamagnetism in Pulsed High Magnetic Fields on Heavy Fermion Superconductor UTe${}_2$
• Field-Induced Superconductivity near the Superconducting Critical Pressure in UTe2
• Field Induced Multiple Superconducting Phases in UTe2 along Hard Magnetic Axis
• Symmetry of magnetic correlations in spin-triplet superconductor UTe2
• Collapse of ferromagnetism and Fermi surface instability near reentrant superconductivity of URhGe
• Enhanced triplet superconductivity in next generation ultraclean UTe2
• Superconducting-Spin Reorientation in Spin-Triplet Multiple Superconducting Phases of UTe2
• Feedback of superconductivity on the magnetic excitation spectrum of UTe${}_2$
• Enhancement and Discontinuity of Effective Mass through the First-Order Metamagnetic Transition in UTe${}_2$
• Field-induced compensation of magnetic exchange as the possible origin of reentrant superconductivity in UTe${}_2$
• Magnetic reshuffling and feedback on superconductivity in UTe2 under pressure
• Three-dimensional critical phase diagram of the Ising antiferromagnet CeRh${}_2$Si${}_2$ under intense magnetic field and pressure
• Longitudinal spin fluctuations driving field-reinforced superconductivity in UTe${}_2$
• Lifshitz Transition and Metamagnetism: Thermoelectric Studies of CeRu${}_2$Si${}_2$
• Pressure Evolution of the Magnetic Field induced Ferromagnetic Fluctuation through the Pseudo-Metamagnetism of CeRu2Si2
• Anisotropic signatures of the electronic correlations in the electrical resistivity of UTe${}_2$
• Anomalous vortex dynamics in spin-triplet superconductor UTe${}_2$
• Low-temperature Magnetic Fluctuations Investigated by ${}^{125}$Te-NMR on the Uranium-based Superconductor 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${}_2$
• Incommensurate antiferromagnetism in UTe2 under pressure
• Intrinsic low-temperature magnetic properties on the ultra-clean UTe${}_2$ with $T_{\mathrm{c}}$ = 2.1 K revealed by ${}^{125}$Te NMR
• Field-angle evolution of the superconducting and magnetic phases of UTe${}_2$ around the $b$ axis
• Metamagnetism in the high-pressure tetragonal phase of UTe${}_2$