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

Kazutaka Kudo, Hiroyuki Ishii, Minoru Nohara

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10 Citations (Scopus)

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 - Condensed Matter and Materials Physics
Volume93
Issue number14
DOIs
Publication statusPublished - Apr 25 2016

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Superconductivity
Dimers
superconductivity
dimers
Chemical analysis
Solid solutions
indication
Substitution reactions
solid solutions
Physical properties
physical properties
Phase transitions
Metals
substitutes
Temperature
temperature
metals

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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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.",
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AB - 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.

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