Giant Phonon Softening and Enhancement of Superconductivity by Phosphorus Doping of BaNi2As2
Giant Phonon Softening and Enhancement of Superconductivity by Phosphorus Doping of BaNi2As2
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DOI：
10.1103/physrevlett.109.097002
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发表时间：
2012-08-29
影响因子：
8.6
通讯作者：
Nohara, M.
中科院分区：
文献类型：
--
作者：
Kudo, K.;Takasuga, M.;Nohara, M.
研究了磷掺杂对BaNi_2（As_（1-x）Px）（2）结构和超导相变的影响。测量了比热、电阻率和磁化率。结果表明，在磷含量较少（x = 0.067）的三斜相（空间群P（1）高于棒）中，超导转变温度（T-c）从0.6 K突然升高。我们的数据分析表明，掺杂诱导的软化与平面内Ni和As（P）声子模式是负责增强的超导性在四相。
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). 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.