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${}_9$.

arXiv comment2 pages, 3 figures, to be published in J. Phys. Soc. Jpn

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Cited by in corpus (1)

• Multiband Superconductivity in Heavy Fermion Compound CePt3Si without Inversion Symmetry: An NMR Study on a High-Quality Single Crystal