Relationship between ferromagnetic criticality and the enhancement of superconductivity induced by transverse magnetic fields in UCoGe

Taisuke Hattori, Kosuke Karube, Kenji Ishida, Kazuhiko Deguchi, Noriaki K. Sato, Tomoo Yamamura

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23 Citations (Scopus)

Abstract

We have performed59Co NMR experiments on the ferromagnetic superconductor UCoGe under magnetic fields (H) along the a- and b-axes to investigate the relationship between ferromagnetic properties and superconductivity. The ferromagnetic ordering temperature TCurie is suppressed and the nuclear spin-lattice relaxation rate 1/T1at 2K is enhanced in H ∥ b, although TCurie and 1/T1are unchanged in H ∥ a, indicating that the ferromagnetic criticality is induced only when H is applied along the b-axis. We show the close relationship between the magnetic anisotropies and the superconducting ones reported by Aoki et al.: the superconductivity is gradually suppressed in H ∥ a, but enhanced in H ∥ b above 5 T. We strongly suggest that the enhancement of the superconductivity observed in H ∥ b originates from the field induced ferromagnetic criticality, as pointed out by Aoki et al. and Mineev.

Original languageEnglish
Article number073708
Journaljournal of the physical society of japan
Volume83
Issue number7
DOIs
Publication statusPublished - 2014 Jul 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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