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

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

2012-04-23

arxiv.org/abs/1204.4958v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

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$\bar{1}$) 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.

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