Boosted magnetic fluctuations at the onset of superconductivity in UTe2 beyond 40 T

T. Thebault; K. Somesh; G. Lapertot; M. Nardone; A. Zitouni; M. Barragan; J. Béard; J. Billette; F. Lecouturier-Dupouy; S. Tardieu; D. Aoki; G. Knebel; D. Braithwaite; W. Knafo

doi:10.1103/3hzr-5qcs

Boosted magnetic fluctuations at the onset of superconductivity in UTe2 beyond 40 T

T. Thebault, K. Somesh, G. Lapertot, M. Nardone, A. Zitouni, M. Barragan, J. Béard, J. Billette, F. Lecouturier-Dupouy, S. Tardieu, D. Aoki, G. Knebel, D. Braithwaite, W. Knafo

DOI 10.1103/3hzr-5qcs · Physical Review B

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Abstract

Several unconventional superconducting phases have been discovered close to a metamagnetic transition in the heavy-fermion compound UTe2. Although suspected to be of magnetic nature, the mechanisms stabilizing these superconducting phases remain mysterious. Here, we present electrical-resistivity measurements on UTe2, with a current I∥a and under pulsed magnetic fields up to 60 T rotating in the (b,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∘ from b to c. The enhancement of A coincides with the stabilization of superconductivity in the polarized paramagnetic regime beyond the metamagnetic field μ0Hm≳40T. 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2	Pressure unresolved	onset
UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3	Pressure not reported	onset
URhGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown