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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。
The metal ions doped YBa2Cu3-x (Fe, Co, Al) xO7-δ (x = 0.0-0.5) were systematically investigated by X-ray diffraction, superconductivity test, oxygen content change, positron annihilation and theoretical calculations. ) Copper superconductors superconductivity, for the sake of comparison also discussed Zn-doped samples of experimental and theoretical results. The results show that there is no direct correlation between the superconducting transition temperature Tc and the valence electron density in the sample, which is the same as the relationship between the Tc and the hole carrier concentration revealed by the Hall experiment, indicating that the electro-acoustic coupling mechanism fails in the copper-oxygen superconductor. Therefore, whether it is hole-pairing or electron-pairing is only a prerequisite for the realization of the superconducting state and is not really the deciding factor. If the copper oxygen superconducting microscopic mechanism is still followed, “electroacoustic coupling” concept is likely to go astray.