Strong Electron--Phonon Coupling Superconductivity Induced by a Low-Lying Phonon in IrGe

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概要

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• The physical properties of the previously reported superconductor IrGe and the Rh<inf>1-x</inf>Ir<inf>x</inf>Ge solid solution are investigated. IrGe has an exceptionally high superconducting transition temperature (T_{\text{c}}=4.7 K) among the isostructural 1:1 late-metal germanides MGe (M=\text{Rh}, Pd, Ir, and Pt). Specific-heat measurements reveal that IrGe has an anomalously low Debye temperature, originating from a low-lying phonon, compared to the other MGe phases. A large jump at T_{\text{c}} in the specific-heat data clearly indicates that IrGe is a strong coupling superconductor. In the Rh<inf>1-x</inf>Ir<inf>x</inf>Ge solid solution, a relationship between an anomalous change in lattice constants and the Debye temperature is observed. We conclude that the unusually high T_{\text{c}} for IrGe is likely due to strong electron--phonon coupling derived from the presence of a low-lying phonon.

• 2013-12-15

著者

• Cava Robert

  Department Of Chemistry Princeton University

• Hirai Daigorou

  Department Of Advanced Materials University Of Tokyo

• Ali Mazhar

  Department of Chemistry, Princeton University, Princeton, NJ 08544, U.S.A.

• Cava Robert

  Department of Chemistry, Princeton University, Princeton, NJ 08544, U.S.A.

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• Strong Electron--Phonon Coupling Superconductivity Induced by a Low-Lying Phonon in IrGe
• Strong Electron-Phonon Coupling Superconductivity Induced by a Low-Lying Phonon in IrGe

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