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

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.
Authors:
; ;  [1]
  1. Princeton
Publication Date:
OSTI Identifier:
1117034
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the Physical Society of Japan; Journal Volume: 82; Journal Issue: 2013
Research Org:
Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
Sponsoring Org:
U.S. AIR FORCE- OFFICE OF SCIENTIFIC RESEARCH
Country of Publication:
United States
Language:
ENGLISH