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

doi:10.1143/JPSJ.76.073708

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

Research output: Contribution to journal › Article › peer-review

72 Citations (Scopus)

Abstract

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 language	English
Article number	073708
Journal	journal of the physical society of japan
Volume	76
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.76.073708
Publication status	Published - Jul 2007
Externally published	Yes

Keywords

Ir Ga
Rh Ga
Specific heat
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.76.073708

Cite this

@article{9a5a30da48324dc2a49032ed5ce3b6cd,

title = "Superconductivity in Rh 2Ga 9 and Ir 2Ga 9 without inversion symmetry",

abstract = "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.",

keywords = "Ir Ga, Rh Ga, Specific heat, Superconductivity",

author = "Takeshi Shibayama and Minoru Nohara and Katori, {Hiroko Aruga} and Yoshihiko Okamoto and Zenji Hiroi and Hidenori Takagi",

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T1 - Superconductivity in Rh 2Ga 9 and Ir 2Ga 9 without inversion symmetry

AU - Shibayama, Takeshi

AU - Nohara, Minoru

AU - Katori, Hiroko Aruga

AU - Okamoto, Yoshihiko

AU - Hiroi, Zenji

AU - Takagi, Hidenori

PY - 2007/7

Y1 - 2007/7

N2 - 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.

AB - 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.

KW - Ir Ga

KW - Rh Ga

KW - Specific heat

KW - Superconductivity

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