Electronic structure, doping, order and disorder in cuprate superconductors

摘要: The electron-phonon and spin-phonon coupling in typical high-T_C cuprates, like LSCO HBCO are peaked for just a few q-vectors because of the 2-dimensional Fermi surface shape. activation modes compensates low electronic density-of-states, superconducting T_C can be high. Thermal disorder lattice perturbs strongly coupled already at moderately high temperature. This happens incoherent potential fluctuations Madelung term reduced coupling. effect puts limit on long-range superconductivity, while persist shorter length scale higher temperatures. BCS-type model calculations used to show how reduce gap T_C. Ordering dopants into stripes has been suggested improve properties, mainly through an increased DOS. Such mechanism seems good way make more resistant thermal doping.