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, Shingo Araki

Research output: Contribution to journalArticle

Abstract

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
Volume683
Issue number1
DOIs
Publication statusPublished - Feb 5 2016

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superconductivity
critical point
augmentation
nuclear magnetic resonance
conduction electrons
wings
divergence
single crystals
electronics

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Quantum tricritical fluctuations driving mass enhancement and reentrant superconductivity in URhGe. / Tokunaga, Y.; Aoki, D.; Mayaffre, H.; Krämer, S.; Julien, M. H.; Berthier, C.; Horvatić, M.; Sakai, H.; Kambe, S.; Hattori, T.; Araki, Shingo.

In: Journal of Physics: Conference Series, Vol. 683, No. 1, 012010, 05.02.2016.

Research output: Contribution to journalArticle

Tokunaga, Y, Aoki, D, Mayaffre, H, Krämer, S, Julien, MH, Berthier, C, Horvatić, M, Sakai, H, Kambe, S, Hattori, T & Araki, S 2016, 'Quantum tricritical fluctuations driving mass enhancement and reentrant superconductivity in URhGe', Journal of Physics: Conference Series, vol. 683, no. 1, 012010. https://doi.org/10.1088/1742-6596/683/1/012010
Tokunaga, Y. ; Aoki, D. ; Mayaffre, H. ; Krämer, S. ; Julien, M. H. ; Berthier, C. ; Horvatić, M. ; Sakai, H. ; Kambe, S. ; Hattori, T. ; Araki, Shingo. / Quantum tricritical fluctuations driving mass enhancement and reentrant superconductivity in URhGe. In: Journal of Physics: Conference Series. 2016 ; Vol. 683, No. 1.
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