MISC

2016年

Quantum tricritical fluctuations driving mass enhancement and reentrant superconductivity in URhGe

TMU INTERNATIONAL SYMPOSIUM ON NEW QUANTUM PHASES EMERGING FROM NOVEL CRYSTAL STRUCTURE
  • Y. Tokunaga
  • ,
  • D. Aoki
  • ,
  • H. Mayaffre
  • ,
  • S. Kraemer
  • ,
  • M. -H. Julien
  • ,
  • C. Berthier
  • ,
  • M. Horyatic
  • ,
  • H. Sakai
  • ,
  • S. Kambe
  • ,
  • T. Hattori
  • ,
  • S. Araki

683
1
記述言語
英語
掲載種別
DOI
10.1088/1742-6596/683/1/012010
出版者・発行元
IOP PUBLISHING LTD

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 Co-59 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 H-R approximate to 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 H-R.


リンク情報
DOI
https://doi.org/10.1088/1742-6596/683/1/012010
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000372176100010&DestApp=WOS_CPL

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