Superconductivity with Tc ≃ 2K was discovered in the intermetallic binary compounds Rh 2Ga 9 and Ir 2Ga 9. This is the first observation of superconductivity in the Rh-Ga and Ir-Ga binary systems. Both compounds crystallize in a distorted Co 2Al 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 c(0) ≃ 130 Oe for Rh 2Ga 9 and type-II superconductivity with an upper critical field H c2(0) ≃ 250 Oe for Ir 2Ga 9.
|Journal||journal of the physical society of japan|
|Publication status||Published - Jul 2007|
- Ir Ga
- Rh Ga
- Specific heat
ASJC Scopus subject areas
- Physics and Astronomy(all)