Conventional $s$-Wave Superconductivity in Noncentrosymmetric Ir${}_2$Ga${}_9$: ${}^{71}$Ga-NQR Evidence

Abstract

We report a ${}^{71}$Ga nuclear-quadrupole-resonance (NQR) study on the characteristics of superconductivity in noncentrosymmetric Ir${}_2$Ga${}_9$ at zero field (H=0). The ${}^{71}$Ga-NQR measurements have revealed that $1/T_1$ has the clear coherence peak just below $T_{\mathrm{c}}$, and decreases exponentially upon further cooling in Ir${}_2$Ga${}_9$. From these results, Ir${}_2$Ga${}_9$ is concluded to be the conventional s-wave superconductor. Despite the lack of spatial centrosymmetry, there are no evidence for unconventional superconducting state ascribed to ASOC in Ir${}_2$Ga${}_9$.

2 pages, 3 figures, to be published in J. Phys. Soc. Jpn

References in corpus (2)

• Spin Triplet Superconducting State due to Broken Inversion Symmetry in Li_2Pt_3B
• Superconductivity in Rh${}_2$Ga${}_9$ and Ir${}_2$Ga${}_9$ without Inversion Symmetry