Superconducting state in the noncentrosymmetric Mg9.3Ir19B16.7 and Mg10.5Ir19B17.1 revealed by NMR
K. Tahara, Z. Li, H. X. Yang, J. L. Luo, S. Kawasaki, Guo-qing Zheng
DOI 10.1103/PhysRevB.80.060503 · Physical Review B
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Abstract
We report B11 NMR measurements in noncentrosymmetric superconductors Mg9.3Ir19B16.7 (Tc=5.8 K) and Mg10.5Ir19B17.1 (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, Mg10.5Ir19B17.1 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Mg9.3Ir19B16.7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.8 | Pressure unresolved | onset |
| Mg10.5Ir19B17.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure unresolved | onset |
| Mg9.3Ir19B16.7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.11 | Pressure unresolved | onset |
| Mg10.5Ir19B17.1 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.45 | Pressure unresolved | onset |
| Li2Pt3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Li2Pd3B Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Mg10Ir19B16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Mg12Ir19B19 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
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