Enhancement and discontinuity of effective mass through the first-order metamagnetic transition in UTe2

Atsushi Miyake, Yusei Shimizu, Yoshiki J. Sato, Dexin Li, Ai Nakamura, Yoshiya Homma, Fuminori Honda, Jacques Flouquet, Masashi Tokunaga, Dai Aoki

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, the metamagnetic transitions in the novel spin-triplet superconductor UTe2 are investigated based on the recently developed simultaneous measurements of magnetization and sample temperature for the applied field along the orthorhombic b-axis and close to the [011] direction, where reentrant superconductivity (RSC) is detected below and above the first-order metamagnetic transition field Hm. Combining Maxwell’s relation and the Clausius–Clapeyron equation, we obtain the field dependence of the Sommerfeld coefficient γ through the first-order metamagnetic transition. A significant enhancement in the effective mass toward Hm is detected in both field directions. In contrast, above Hm, the effective mass discontinuously decreases for H ∥ b, while it discontinuously increases for H ∥ ∼[011], which plays a crucial role in the RSC.

Original languageEnglish
Article number103702
Journaljournal of the physical society of japan
Volume90
Issue number10
DOIs
Publication statusPublished - Oct 15 2021

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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