Composition-induced structural instability and strong-coupling superconductivity in Au1-xPdxTe2

Kazutaka Kudo, Hiroyuki Ishii, Minoru Nohara

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Abstract

The physical properties and structural evolution of the MX2-type solid solution Au1-xPdxTe2 are reported. The end member AuTe2 is a normal metal with a monoclinic distorted CdI2-type structure with preformed Te-Te dimers. A monoclinic-trigonal structural phase transition at a finite temperature occurs upon Pd substitution and is suppressed to zero temperature near x=0.55, and a superconducting phase with a maximum Tc=4.65 K emerges. A clear indication of strong-coupling superconductivity is observed near the composition of the structural instability. The competitive relationship between Te-Te dimers and superconductivity is proposed.

Original languageEnglish
Article number140505
JournalPhysical Review B
Volume93
Issue number14
DOIs
Publication statusPublished - Apr 25 2016

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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