Spin-triplet superconductivity induced by longitudinal ferromagnetic fluctuations in UCoGe probed by59Co NMR measurement

Taisuke Hattori, Yoshihiko Ihara, Kosuke Karube, Daisuke Sugimoto, Kenji Ishida, Kazuhiko Deguchi, Noriaki K. Sato, Tomoo Yamamura

研究成果: Review article査読

11 被引用数 (Scopus)

抄録

In this review, we present a summary of our experimental results suggesting that the superconducting ferromagnet UCoGe is a spin-triplet superconductor, along with some of the basic physical properties of UCoGe in the normal state. We show experimental evidence that superconductivity in UCoGe is mediated by longitudinal ferromagnetic fluctuations predominant above the superconducting-transition temperature TSC. This is obtained from the tuning of ferromagnetic fluctuations and superconductivity by changing the external field along the magnetic easy axis, the c-axis. In addition, we show that the spin susceptibility perpendicular to the spontaneous magnetic moment, which is probed by Knight-shift measurement, is almost constant in the superconducting state. The behavior of the susceptibility and the invariance of the spontaneous moment below TSCcan be consistently explained by the equal-spin pairing state with a large exchange field along the c-axis.

本文言語English
論文番号061012
ジャーナルjournal of the physical society of japan
83
6
DOI
出版ステータスPublished - 2014 6月 15

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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