Magnetic-field-induced phenomena in the paramagnetic superconductor Ute2

William Knafo, Michal Vališka, Daniel Braithwaite, Gérard Lapertot, Georg Knebel, Alexandre Pourret, Jean Pascal Brison, Jacques Flouquet, Dai Aoki

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45 Citations (Scopus)


We present magnetoresistivity measurements on the heavy-fermion superconductor UTe2 in pulsed magnetic fields μ0H up to 68T and temperatures T from 1.4 to 80K. Magnetic fields applied along the three crystallographic directions a (easy magnetic axis), b, and c (hard magnetic axes), are found to induce different phenomena—depending on the field direction—beyond the low-field suppression of the superconducting state. For H ∥ a, a broad anomaly in the resistivity is observed at 0H ’ 10T and T = 1.4K. For H ∥ c, no magnetic transition nor crossover are observed. For H ∥ b, a sharp first-order-like step in the resistivity indicates a metamagnetic transition at the field 0Hm ’ 35T. When the temperature is raised signature of first-order metamagnetism is observed up to a critical endpoint at TCEP ’ 7K. At higher temperatures a crossover persists up to 28K, i.e., below the temperature Tmax ¼ 35K where the magnetic susceptibility is maximal. A sharp maximum in the Fermi-liquid quadratic coefficient A of the low-temperature resistivity is found at Hm. It indicates an enhanced effective mass associated with critical magnetic fluctuations, possibly coupled with a Fermi surface instability.

Original languageEnglish
Article number063705
JournalJournal of the Physical Society of Japan
Issue number6
Publication statusPublished - 2019


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