期刊
PHYSICAL REVIEW B
卷 86, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.100505
关键词
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资金
- US DOE Office of Basic Energy Sciences [DE-FG02-45706]
- US DOE, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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 T-c = 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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