Strong electron-Phonon coupling superconductivity induced by a low-Lying phonon in irGe

Daigorou Hirai, Mazhar N. Ali, Robert J. Cava

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Abstract

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 1/4 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.

Original languageEnglish (US)
Article number124701
JournalJournal of the Physical Society of Japan
Volume82
Issue number12
DOIs
StatePublished - Dec 1 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Keywords

  • IrGe
  • Low-Lying phonon
  • Strong electron-Phonon coupling
  • Superconductivity
  • Transition-Metal germanide

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