Quantum tricritical fluctuations driving mass enhancement and reentrant superconductivity in URhGe

Y. Tokunaga, D. Aoki, H. Mayaffre, S. Krämer, M. H. Julien, C. Berthier, M. Horvatić, H. Sakai, S. Kambe, T. Hattori, S. Araki

Research output: Contribution to journalConference articlepeer-review


The field-induced reentrant superconductivity (RSC) discovered near a quantum critical point (QCP) in a ferromagnetic superconductor URhGe highlights the close interplay between superconductivity and magnetism. While the origin of the RSC is broadly thought to be associated with quantum critical fluctuations, their exact nature had not been well identified. Here we review our recent 59Co NMR study in a single crystal of URh0.9Co0.1Ge. Our measurements of the NMR spin-spin relaxation reveal a divergence of electronic spin fluctuations in the vicinity of the field-induced QCP at HR ≈ 13 T. The fluctuations observed are characteristic of a tricritical point, followed by a phase bifurcation toward quantum wing-critical points. We show that these tricritical fluctuations enhance the effective mass of the conduction electrons and, further, drive the RSC near the HR.

Original languageEnglish
Article number012010
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - Feb 5 2016
EventTMU International Symposium on New Quantum Phases Emerging from Novel Crystal Structure - Tokyo, Japan
Duration: Sept 24 2015Sept 25 2015

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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