Observation of longitudinal magnetic fluctuations at a first-order ferromagnetic quantum phase transition in UGe2

Yuichiro Noma, Hisashi Kotegawa, Tetsuro Kubo, Hideki Tou, Hisatomo Harima, Yoshinori Haga, Etsuji Yamamoto, Yoshichika Onuki, Kohei M. Itoh, Ai Nakamura, Yoshiya Homma, Fuminori Honda, Dai Aoki

研究成果: Article査読

抄録

The connection between ferromagnetic (FM) fluctuations and superconductivity has been well established in FM superconductors UCoGe and URhGe. However, this connection has not been clarified in UGe2, in which pressureinduced superconductivity emerges in the FM phase. We show results focusing on the spin-echo decay rate, 1=T2, obtained using 73Ge-nuclear magnetic resonance (NMR) under pressure, which reveals longitudinal magnetic fluctuations in UGe2. These fluctuations originate in a FM critical point located at a nonzero temperature and developed near the first-order FM quantum phase transition. This remarkable feature at the high-pressure side, where a superconducting anomaly has been clearly observed, provides a connection of FM fluctuations and superconductivity in UGe2. This strongly supports a consensus that superconductivity in ferromagnets is universally mediated by anisotropic magnetic fluctuations.

本文言語English
論文番号073707
ジャーナルjournal of the physical society of japan
90
7
DOI
出版ステータスPublished - 2021 7 1

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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