Giant phonon softening and enhancement of superconductivity by phosphorus doping of BaNi 2As 2

K. Kudo, M. Takasuga, Y. Okamoto, Z. Hiroi, M. Nohara

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30 Citations (Scopus)

Abstract

The effects of phosphorus doping on the structural and superconducting phase transitions of BaNi 2(As 1-xP x) 2 were studied. The specific heat, resistivity, and magnetic susceptibility were measured. The results revealed an abrupt increase in the superconducting transition temperature (T c) from 0.6 K in the triclinic phase (space group P1̄) with less phosphorus (x≤0.067) to 3.3 K in the tetragonal phase (space group I4/mmm) with more phosphorus (x≥0.067). Our data analysis suggests that a doping-induced softening related to an in-plane Ni and As(P) phonon mode is responsible for the enhanced superconductivity in the tetragonal phase.

Original languageEnglish
Article number097002
JournalPhysical Review Letters
Volume109
Issue number9
DOIs
Publication statusPublished - Aug 29 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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