Superconductivity in Rh${}_2$Ga${}_9$ and Ir${}_2$Ga${}_9$ without Inversion Symmetry

Abstract

Superconductivity with $T_{\mathrm{c}}$ $\simeq$ 2 K was discovered in the intermetallic binary compounds Rh${}_2$Ga${}_9$ and Ir${}_2$Ga${}_9$. This is the first observation of superconductivity in the Rh-Ga and Ir-Ga binary systems. Both compounds crystallize in a distorted Co${}_2$Al${}_9$-type structure (monoclinic, space group: $Pc$), which lacks spatial inversion symmetry. Specific heat measurements revealed that both compounds are weak-coupling BCS superconductors having an isotropic superconducting gap. Measurements in magnetic fields indicated type-I superconductivity with a critical field $H_{\mathrm{c}}(0)$ $\simeq$ 130 Oe for Rh${}_2$Ga${}_9$ and type-II superconductivity with an upper critical field $H_{c2}(0)$ $\simeq$ 250 Oe for Ir${}_2$Ga${}_9$.

arXiv commentto appear in J. Phys. Soc. Jpn. Vol. 76, No. 7 (2007)

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