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, Shinji 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

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Nuclear magnetic resonance
Defects
nuclear magnetic resonance
Spin-lattice relaxation
Superconducting materials
Orbits
defects
spin-lattice relaxation
orbits
magnetic permeability
Temperature
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Superconducting state in the noncentrosymmetric Mg9.3 Ir19 B16.7 and Mg10.5 Ir19 B17.1 revealed by NMR. / Tahara, K.; Li, Z.; Yang, H. X.; Luo, J. L.; Kawasaki, Shinji; Zheng, Guo-Qing.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 6, 060503, 11.08.2009.

Research output: Contribution to journalArticle

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