Emergence of superconductivity in BaNi 2(Ge 1-xP x) 2 at a structural instability

Daigorou Hirai, F. Von Rohr, R. J. Cava

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Abstract

The physical properties and structural evolution of the 122-type solid solution BaNi 2(Ge 1-xP x) 2 are reported. The in-plane X-X (X = Ge 1-xP x) dimer formation present in the end member BaNi 2Ge 2, which results in a structural transition to orthorhombic symmetry, is completely suppressed to zero temperature on P substitution near x=0.7, and a dome-shaped superconducting phase with a maximum T c=2.9 K emerges. Clear indications of phonon softening and enhanced electron-phonon coupling are observed at the composition of the structural instability. Our findings show that dimer breaking offers possibilities as a tuning parameter of superconductivity.

Original languageEnglish (US)
Article number100505
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number10
DOIs
StatePublished - Sep 19 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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