价电子密度与Y123铜氧超导电性关系研究

稀有金属材料与工程, 2013, 42(4): 706-711.

价电子密度与Y123铜氧超导电性关系研究

王晓霞 ^1, , 尉国茹 ^2, , 申振宁 ^3, , 姚尚彬 ^4, , 李平林 ^5,

1.郑州大学河南省量子功能材料国际联合实验室,河南郑州450001

2.郑州大学河南省量子功能材料国际联合实验室,河南郑州450001

3.郑州大学河南省量子功能材料国际联合实验室,河南郑州450001

4.郑州大学河南省量子功能材料国际联合实验室,河南郑州450001

5.郑州大学河南省量子功能材料国际联合实验室,河南郑州450001

基金项目: 大学生创新创业训练项目(2012cxcy070) 国家自然科学基金(10647145)

关键词： Y123金属离子掺杂 , 理论计算 , 正电子湮没 , 价电子密度 , 电声耦合

Reflections of Superconductivity Unrelated to Valence Electron Density in Metal Doped Y123 Cuprates

通过X射线衍射、超导电性测试、氧含量变化、正电子湮没以及理论计算等方法, 系统研究了金属离子掺杂的YBa2Cu3-x(Fe,Co,Al)xO7-δ (x=0.0～0.5)铜氧超导体的超导电性,为了比较也一并讨论了Zn掺杂样品的实验和理论结果.研究表明,超导转变温度Tc与样品中价电子密度无直接关联,与Hall实验揭示的Tc与空穴载流子浓度关系有同样结论,表明电声耦合机制在铜氧超导体中失效.因此,无论是空穴配对还是电子配对,仅仅是实现超导态的前提,并非其真正的决定因素.如果铜氧超导微观机制依然沿袭“电声耦合”理念很可能误入歧途.

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材料期刊网

价电子密度与Y123铜氧超导电性关系研究

Reflections of Superconductivity Unrelated to Valence Electron Density in Metal Doped Y123 Cuprates

参考文献