高温超导体——超导态的变分理论
超导电性
2009-11-10 v3 强关联电子
摘要
我们采用变分方法来阐明高温 cuprate 超导体在T=0条件下的强相关 d 波超导态。我们表明，强相关导致配对规模和相干性之间出现质变趋势：配对规模随空洞掺杂呈单调减小，而超导序参量显示出非单调的拱形变化。我们获得了大量可观测量的掺杂依赖性详细结果，包括化学势、相干长度、动量分布、节点准粒子权重和色散、光谱中无相干特征、光谱权重和超流密度。我们的结果与现有数据在 remarkable 定量一致，一些预测（首次报道于Phys. Rev. Lett. {\bf 87}, 217002 (2001)）已被最近验证。
引用
@article{arxiv.cond-mat/0305611,
title = {High Tc Superconductors -- A Variational Theory of the Superconducting State},
author = {Arun Paramekanti and Mohit Randeria and Nandini Trivedi},
journal= {arXiv preprint arXiv:cond-mat/0305611},
year = {2009}
}
备注
(Minor revisions, 1 figure added, version to appear in PRB) 23 RevTeX pages, 11 eps figs, long version of cond-mat/0101121, contains detailed comparisons with experiments, analytical insights, technical aspects of the calculation, and comparison with slave boson MFT