Superconductivity in Rh 2Ga 9 and Ir 2Ga 9 without inversion symmetry

Takeshi Shibayama, Minoru Nohara, Hiroko Aruga Katori, Yoshihiko Okamoto, Zenji Hiroi, Hidenori Takagi

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72 Citations (Scopus)


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.

Original languageEnglish
Article number073708
Journaljournal of the physical society of japan
Issue number7
Publication statusPublished - Jul 2007
Externally publishedYes


  • Ir Ga
  • Rh Ga
  • Specific heat
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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