Field-induced superconductivity near the superconducting critical pressure in UTe2

Dai Aoki, Motoi Kimata, Yoshiki J. Sato, Georg Knebel, Fuminori Honda, Ai Nakamura, Dexin Li, Yoshiya Homma, Yusei Shimizu, William Knafo, Daniel Braithwaite, Michal Valiŝka, Alexandre Pourret, Jean Pascal Brison, Jacques Flouquet

研究成果: Contribution to journalArticle査読

4 被引用数 (Scopus)

抄録

We report the magnetoresistance under pressure in the novel spin-triplet superconductor UTe2 close to the critical pressure Pc, where the superconducting phase terminates, for field along the three a, b, and c-axes in the orthorhombic structure. The superconducting phase for H || a-axis just below Pc shows a field-reentrant behavior due to the competition with the emergence of magnetic order at low fields. The upper critical field Hc2 for H || c-axis shows a quasi-vertical increase in the H-T phase diagram just below Pc, indicating that superconductivity is reinforced by the strong fluctuations which persist even at high fields above 20 T. Increasing pressure leads to the disappearance of superconductivity at zero field with the emergence of magnetic order. Surprisingly, field-induced superconductivity is observed at high fields, where a spin-polarized state is realized due to the suppression of the magnetic ordered phases; the spin-polarized state is favorable for superconductivity, whereas the magnetic ordered phase at low field seems to be unfavorable. The huge Hc2 in the spin-polarized state seems to imply a spin-triplet state. Contrary to the a- and c-axes, no field-reinforcement of superconductivity occurs for magnetic field along the b-axis. We compare the results with the field-reentrant superconductivity above the metamagnetic field, Hm for the field direction tilted by ~30 deg from b to caxis at ambient pressure as well as the field-reentrant (-reinforced) superconductivity in ferromagnetic superconductors, URhGe and UCoGe.

本文言語英語
論文番号074705
ジャーナルjournal of the physical society of japan
90
7
DOI
出版ステータス出版済み - 7 1 2021
外部発表はい

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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