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The physical properties and structural evolution of the 122-type solidsolution BaNi2(Ge1-xPx)2 are reported. The in-plane X-X (X = Ge1-xPx) dimerformation present in the end member BaNi2Ge2, which results in a structuraltransition to orthorhombic symmetry, is completely suppressed to zerotemperature on P substitution near x = 0.7, and a dome-shape superconductingphase with a maximum Tc = 2.9 K emerges. Clear indications of phonon softeningand enhanced electron-phonon coupling are observed at the composition of thestructural instability. Our findings show that dimer breaking offers newpossibilities as a tuning parameter of superconductivity.

The emergence of superconductivity in BaNi2(Ge1-xPx)2 at a structural instability