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 language | English |
|---|---|
| Article number | 060503 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 80 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - Aug 11 2009 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics