Thermodynamic Properties of the Non-centrosymmetric Type-I Superconductor Rh2Ga9 and Ir2Ga9

We report low-temperature specific heat measurements on the single-crystalline non-centrosymmetric superconductors T2Ga9 (T=Rh, Ir) with Tc=1.95 and 2.25 K. Electronic contribution on the specific heat, Cel, in each compound is well described by the BCS scheme, suggesting that both Rh2Ga9 and Ir2Ga9...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2009, Vol.78 (3)
Main Authors: WAKUI, Kouhei, AKUTAGAWA, Satoshi, KASE, Naoki, KAWASHIMA, Kenji, MURANAKA, Takahiro, IWAHORI, Yasufumi, ABE, Jiro, AKIMITSU, Jun
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Physics
Properties of type I and type II superconductors
Superconductivity
Thermodynamic properties
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Summary:We report low-temperature specific heat measurements on the single-crystalline non-centrosymmetric superconductors T2Ga9 (T=Rh, Ir) with Tc=1.95 and 2.25 K. Electronic contribution on the specific heat, Cel, in each compound is well described by the BCS scheme, suggesting that both Rh2Ga9 and Ir2Ga9 fully open an isotropic gap in the superconducting state. The values of δC/γTc and 2δ(0)/kBTc indicate that both compounds are categorized as a weak coupling superconductor. The value of κ obtained from specific heat as a function of magnetic field strongly suggestes that T2Ga9 is a type-I superconductor.
ISSN:0031-9015
1347-4073
DOI:10.1143/jpsj.78.034710