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The effects of phosphorus doping on the structural and superconducting phasetransitions of BaNi$_2$(As$_{1-x}$P$_x$)$_2$ were studied. The specific heat,resistivity, and magnetic susceptibility were measured. The results revealed anabrupt increase in the superconducting transition temperature ($T_c$) from 0.6K 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 adoping-induced softening related to an in-plane Ni and As(P) phonon mode isresponsible for the enhanced superconductivity in the tetragonal phase.

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