Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe2

Y. Tokiwa; P. Opletal; H. Sakai; S. Kambe; E. Yamamoto; M. Kimata; S. Awaji; T. Sasaki; D. Aoki; Y. Haga; Y. Tokunaga

doi:10.1103/PhysRevB.109.L140502

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Reinforcement of superconductivity by quantum critical fluctuations of metamagnetism in UTe2

Y. Tokiwa, P. Opletal, H. Sakai, S. Kambe, E. Yamamoto, M. Kimata, S. Awaji, T. Sasaki, D. Aoki, Y. Haga, Y. Tokunaga

DOI 10.1103/PhysRevB.109.L140502 · Physical Review B

T1

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Abstract

The normal-conducting state of the superconductor UTe2 is studied by entropy analysis for magnetic fields along the b axis, obtained from magnetization using the relation (∂M/∂T)B=(∂S/∂B)T. We observe a strong increase in entropy with magnetic field due to metamagnetic (MM) fluctuations (spatially uniform, Q=0). The field dependence is well described by the Hertz-Millis-Moriya theory for quantum criticality of itinerant MM. Notably, the lower bound of the quantum-critical region coincides well with the position of the minimum in the superconducting transition temperature Tc(B). Hence, our results suggest that Q=0 fluctuations reinforce the superconductivity.

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.	1.6	Pressure not reported	unknown
UTe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.7	Pressure not reported	unknown
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