Strong Electron-Phonon Coupling Superconductivity Induced by a Low-Lying Phonon in IrGe
- Princeton
The physical properties of the previously reported superconductor IrGe and the Rh1-xIrxGe solid solution are investigated. IrGe has an exceptionally high superconducting transition temperature (Tc=4.7 K) among the isostructural 1:1 late-metal germanides MGe (M=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 Tc in the specific-heat data clearly indicates that IrGe is a strong coupling superconductor. In the Rh1-xIrxGe solid solution, a relationship between an anomalous change in lattice constants and the Debye temperature is observed. We conclude that the unusually high Tc for IrGe is likely due to strong electron–phonon coupling derived from the presence of a low-lying phonon.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- U.S. AIR FORCE- OFFICE OF SCIENTIFIC RESEARCH
- OSTI ID:
- 1117034
- Journal Information:
- Journal of the Physical Society of Japan, Vol. 82, Issue 2013; ISSN 0031-9015
- Country of Publication:
- United States
- Language:
- ENGLISH
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