Superconductivity Induced by Longitudinal Ferromagnetic Fluctuations in UCoGe

• Hattori, T.

• Ihara, Y.

• Nakai, Y.

• Ishida, K.

• Tada, Y.

• Fujimoto, S.

• Kawakami, N.

• Osaki, E.

• Deguchi, K.

• Sato, N.

• Satoh, I.

Abstract

From detailed angle-resolved NMR and Meissner measurements on a ferromagnetic (FM) superconductor UCoGe (TCurie∼2.5  K and TSC∼0.6  K), we show that superconductivity in UCoGe is tightly coupled with longitudinal FM spin fluctuations along the c axis. We found that magnetic fields along the c axis (H∥c) strongly suppress the FM fluctuations and that the superconductivity is observed in the limited magnetic-field region where the longitudinal FM spin fluctuations are active. These results, combined with model calculations, strongly suggest that the longitudinal FM spin fluctuations tuned by H∥c induce the unique spin-triplet superconductivity in UCoGe. This is the first clear example that FM fluctuations are intimately related with superconductivity.

Journal

• Physical Review Letters

  Physical Review Letters 108 (6), 066403-, 2012-02

  American Physical Society (APS)

Keywords

• General Physics and Astronomy

Details

• CRID: 1050845760656445696
• NII Article ID: 120003779211
• NII Book ID: AA00773679
• ISSN: 00319007
• ISSN: 10797114
• DOI: 10.1103/physrevlett.108.066403
• HANDLE: 2433/152476
• Web Site: http://link.aps.org/article/10.1103/PhysRevLett.108.066403
• Web Site: http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.108.066403/fulltext
• Text Lang: en
• Article Type: journal article
• Data Source:
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  • Crossref
  • CiNii Articles
  • KAKEN