Physics – Condensed Matter – Superconductivity
Scientific paper
2009-08-20
Phys. Rev. B 80, 060503(R) (2009)
Physics
Condensed Matter
Superconductivity
for a proper, high-resolution Fig.5, contact the corresponding author
Scientific paper
10.1103/PhysRevB.80.060503
We report ^{11}B NMR measurements in non-centrosymmetric superconductors Mg_{9.3}Ir_{19}B_{16.7} (T_c=5.8 K) and Mg_{10.5}Ir_{19}B_{17.1} (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, Mg_{10.5}Ir_{19}B_{17.1} 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.
Kawasaki Shigeo
Li Zaidong
Luo Jian-Lin
Tahara K.
Yang Han-Xin
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