Possible nodeless superconductivity in the noncentrosymmetric superconductor Mg12−δIr19B16
Gang Mu, Yue Wang, Lei Shan, Hai-Hu Wen
DOI 10.1103/PhysRevB.76.064527 · Physical Review B
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Abstract
We measured the resistivity, diamagnetization, and low-temperature specific heat of the newly discovered noncentrosymmetric superconductor Mg12−δIr19B16. The temperature dependence of specific heat is consistent with the model of an isotropic s-wave gap with value Δ0≈0.94meV for the sample Tc=5.7K, and the ratio Δ0∕kBTc≈1.91 indicates a slightly moderate coupling for the superconductivity. The correlations among the normal state Sommerfeld constant γn, the slope −dμ0Hc2(T)∕dT near Tc, and the condensation energy Ec are all consistent with the slightly moderate coupling picture. Based on the data of phonon contribution, Tc and the McMillan formula, we obtained an electron-phonon coupling strength λe−ph≈0.66, which suggests that the superconductivity here is induced by the electron-phonon coupling.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Mg12-δIr19B16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.7 | Pressure not reported | unknown |
| Mg10Ir19B16 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
| 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 |
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