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Emergence of superconductivity in BaNi (Ge P ) at a structural instability

Author(s): Hirai, Daigorou; von Rohr, Fabian; Cava, Robert J

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Abstract: 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.
Publication Date: Sep-2012
Electronic Publication Date: 19-Sep-2012
Citation: Hirai, Daigorou, von Rohr, F, Cava, RJ. (2012). Emergence of superconductivity in BaNi (Ge P ) at a structural instability. Physical Review B, 86 (10), 10.1103/PhysRevB.86.100505
DOI: doi:10.1103/PhysRevB.86.100505
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 100505-1 - 100505-5
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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