Journal
PHYSICAL REVIEW B
Volume 80, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.060503
Keywords
boron alloys; Cooper pairs; iridium alloys; Knight shift; magnesium alloys; spin-lattice relaxation; spin-orbit interactions; superconducting energy gap; superconducting materials
Funding
- MEXT
- JSPS
- NSF of China [17072005, 20244058]
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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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