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

Research output: Contribution to journalReview article

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number061012
Journaljournal of the physical society of japan
Volume83
Issue number6
DOIs
Publication statusPublished - 2014 Jun 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Hattori, T., Ihara, Y., Karube, K., Sugimoto, D., Ishida, K., Deguchi, K., Sato, N. K., & Yamamura, T. (2014). Spin-triplet superconductivity induced by longitudinal ferromagnetic fluctuations in UCoGe probed by59Co NMR measurement. journal of the physical society of japan, 83(6), [061012]. https://doi.org/10.7566/JPSJ.83.061012