期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.097002
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) [23740274]
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program) from the JSPS
- Grants-in-Aid for Scientific Research [24654106, 23740274] Funding Source: KAKEN
The effects of phosphorus doping on the structural and superconducting phase transitions of BaNi2(As1-xPx)(2) were studied. The specific heat, resistivity, and magnetic susceptibility were measured. The results revealed an abrupt increase in the superconducting transition temperature (T-c) from 0.6 K in the triclinic phase (space group P (1) over bar) with less phosphorus (x <= 0.067) to 3.3 K in the tetragonal phase (space group I4/mmm) with more phosphorus (x >= 0.067). Our data analysis suggests that a doping-induced softening related to an in-plane Ni and As(P) phonon mode is responsible for the enhanced superconductivity in the tetragonal phase.
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