Scientific article
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Emergence of superconductivity in BaNi2(Ge1−xPx)2 at a structural instability

Publication date2012-09-19
First online date2012-09-19

The physical properties and structural evolution of the 122-type solid solution BaNi2(Ge1−xPx)2 are reported. The in-plane X-X (X = Ge1−xPx) dimer formation present in the end member BaNi2Ge2, which results in a structural transition to orthorhombic symmetry, is completely suppressed to zero temperature on P substitution near x = 0.7, and a dome-shaped superconducting phase with a maximum Tc = 2.9 K emerges. Clear indications of phonon softening and enhanced electron-phonon coupling are observed at the composition of the structural instability. Our findings show that dimer breaking offers possibilities as a tuning parameter of superconductivity.

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Citation (ISO format)
HIRAI, Daigorou, VON ROHR, Fabian, CAVA, R. J. Emergence of superconductivity in BaNi<sub>2</sub>(Ge<sub>1−x</sub>P<sub>x</sub>)<sub>2</sub> at a structural instability. In: Physical review. B, Condensed matter and materials physics, 2012, vol. 86, n° 10, p. 100505. doi: 10.1103/PhysRevB.86.100505
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Article (Published version)
ISSN of the journal1098-0121

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