层状铜氧化物超导体的有限温Landau理论

采用有限温的Landau理论来描述层状铜氧化物超导体中的竞争序和层间Josephson隧道效应 .通过讨论单层和双层铜氧面结构的超导体中序参量的相图，并与实验相比较来确定理论中 唯象参数的合理范围，同时也解释了在最佳掺杂区附近赝能隙的转变温度远高于与之对应的 能量尺度这个颇具疑惑的实验事实.再将理论应用到多层的超导体系，计算了超导转变温度 T_c随体系层数N的变化，在合理的参数空间里，最佳掺杂区附近的计算结果与现 有的实验相一致，而在极度欠掺杂区和极度过掺杂区的单调性上升可作为理论预言关键词：竞争序层间Josephson隧道效应电荷不平衡赝能隙

A finite-temperature Landau theory for multilayered cuprate superconductors

A finite-temperature Landau theory is proposed to describe competing orders and interlayer tunneling in multilayered cuprate superconductors. For mono- and do uble-layered superconductors, the zero temperature order parameters and transiti on temperatures are calculated as functions of doping concentration. By comparin g such phase diagrams with relevant experiments, the phenomenolgical parameters in the theory are determined. Then we apply the theory to multilayered supercond uctors and determine the superconducting transition temperature as a function of layer number N in the underdoped, nearly optimally doped and overdoped region, respectively. In a reasonable parameter space the result of optimally doped regi on turns out to be in agreement with experiment, and as theoretical predictions, in the very underdoped and very overdoped case, T_c increases monoton ically with N.