Nodeless Superconductivity in the Noncentrosymmetric Superconductor $M{g}_{10}I{r}_{19}{B}_{16}$

Abstract

We measured the resistivity, diamagnetization and low temperature specific heat of the newly discovered noncentrosymmetric superconductor $M{g}_{10}I{r}_{19}{B}_{16}$. It is found that the superconducting gap has an s-wave symmetry with a value of about ${\Delta }_0\approx$ 0.6 meV, and the ratio ${\Delta }_0/k_B{T}_c\approx 1.86$ indicates a weak coupling for the superconductivity. The correlations among the normal state Sommerfeld constant ${\gamma }_n$, the slope $-d{\mu }_0{H}_{c2}(T)/dT$ near Tc and the condensation energy Ec are all consistent with the weak coupling picture. The separated phonon contribution from the specific heat shows that the conduction electrons of the $Ir$ atoms interact most strongly with the vibrations of themselves, instead of with that of the light element boron.

5 pages, 5 figures; added references, corrected typos

References in corpus (1)

• Spin Triplet Superconducting State due to Broken Inversion Symmetry in Li_2Pt_3B

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