摘要
利用紧束缚模型，对ｓｄ混合波的存在性作了讨论．在ＧｉｎｚｂｕｒｇＬａｎｄａｎ理论框架下，严格求解了高温超导体混合配对态磁通涡旋结构．结果表明，其磁通涡旋的分布与单个涡旋的结构密切相关．在低温下，由于序参量ｓ波成分的存在及它与ｄ波分量的耦合，引起局域磁场和ｄ波分量的各向异性，使磁通涡旋呈斜格子分布，而在温度近于转变温度时，各向异性消失，涡旋态转化为三角格子．
Abstract Starting from a tight binding description,the existence of mixed s d wave pairing state is discussed. Then,within the framework of the phenomenological G L theory, the structure of vortex lattice in a high T c superconductor is studied.It is shown that there is a strong correlation between the structure of a single vortex and the shape of the vortex lattice.At low temperatures,with the existence of s wave component and its coupling to d wave component,the d wave order parameter and the local magnetic field show tetragonal anisotropy,and the structure of vortex lattice is oblique;however,when the temperature is close to T c, it may become triangular.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第2期352-362,共11页
Acta Physica Sinica
基金
国家自然科学基金
上海市教育委员会曙光计划资助
