Metamagnetic Transition in Heavy Fermion Superconductor UTe2

We studied the magnetization of the recently discovered heavy fermion superconductor UTe2 up to 56 T in pulsed-magnetic fields. A first-order metamagnetic transition was clearly observed at Hm = 34.9 T, when a magnetic field H was applied along the orthorhombic hard-magnetization b-axis. The transit...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2019-06, Vol.88 (6), p.063706
Main Authors: Miyake, Atsushi, Shimizu, Yusei, Sato, Yoshiki J, Li, Dexin, Nakamura, Ai, Homma, Yoshiya, Honda, Fuminori, Flouquet, Jacques, Tokunaga, Masashi, Aoki, Dai
Format: Article
Language:English
Subjects:
Crossovers
Dependence
Fermions
Ferromagnetism
Heavy fermion superconductors
Magnetic fields
Magnetism
Magnetization
Superconductivity
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Summary:We studied the magnetization of the recently discovered heavy fermion superconductor UTe2 up to 56 T in pulsed-magnetic fields. A first-order metamagnetic transition was clearly observed at Hm = 34.9 T, when a magnetic field H was applied along the orthorhombic hard-magnetization b-axis. The transition has a critical end point at ∼11 K and 34.7 T, where the first order transition terminates and changes into a crossover regime. Using the thermodynamic Maxwell relation, we evaluated the field dependence of the Sommerfeld coefficient of specific heat, which is directly related to the superconducting pairing. From the analysis, we found a significant enhancement of the effective mass centered at Hm, which is reminiscent of the field-reentrant superconductivity of the ferromagnet URhGe in transverse fields. We discuss the origin of their field-robust superconductivity.
ISSN:0031-9015
1347-4073
DOI:10.7566/JPSJ.88.063706