4.6 Article

Superconducting state in the noncentrosymmetric Mg9.3Ir19B16.7 and Mg10.5Ir19B17.1 revealed by NMR

期刊

PHYSICAL REVIEW B
卷 80, 期 6, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.060503

关键词

boron alloys; Cooper pairs; iridium alloys; Knight shift; magnesium alloys; spin-lattice relaxation; spin-orbit interactions; superconducting energy gap; superconducting materials

资金

  1. MEXT
  2. JSPS
  3. NSF of China [17072005, 20244058]

向作者/读者索取更多资源

We report B-11 NMR measurements in noncentrosymmetric superconductors Mg9.3Ir19B16.7 (T-c=5.8 K) and Mg10.5Ir19B17.1 (T-c=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, Mg10.5Ir19B17.1 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.

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