Superconducting state in the noncentrosymmetric Mg9.3 Ir19 B16.7 and Mg10.5 Ir19 B17.1 revealed by NMR

K. Tahara, Z. Li, H. X. Yang, J. L. Luo, S. Kawasaki, Guo Qing Zheng

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We report B 11 NMR measurements in noncentrosymmetric superconductors Mg9.3 Ir19 B16.7 (Tc =5.8 K) and Mg10.5 Ir19 B17.1 (Tc =4.8 K). The spin-lattice relaxation rate and the Knight shift indicate that the Cooper pairs are predominantly in the spin-singlet state with an isotropic gap. However, Mg10.5 Ir19 B17.1 is found to have more defects and the spin susceptibility remains finite even in the zero-temperature limit. We interpret this result as that the defects enhance the spin-orbit coupling and bring about more spin-triplet component.

Original languageEnglish
Article number060503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number6
DOIs
Publication statusPublished - Aug 11 2009

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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