Giant Phonon Softening and Enhancement of Superconductivity by Phosphorus Doping of BaNi2As2

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

doi:10.1103/PhysRevLett.109.097002

paper

Giant Phonon Softening and Enhancement of Superconductivity by Phosphorus Doping of BaNi2As2

arXiv:1204.4958 · doi:10.1103/PhysRevLett.109.097002

Abstract

The effects of phosphorus doping on the structural and superconducting phase transitions of BaNi $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ 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 P $1 ˉ$ ) with less phosphorus (0 $\leq$ $x$ $\leq$ 0.067) to 3.3 K in the tetragonal phase (space group I4/mmm) with more phosphorus ( $x$ $\geq$ 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.

5 pages, 4 figures

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