Strong electron correlation and phonon coupling in high T-c superconductors
作者： Sven Larsson
DOI: 10.1016/J.PHYSC.2007.03.217
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摘要: Systems with one active electron (or hole) per site may be spin-alternating (SDW) or charge alternating (CDW). Typical SDW systems (CuO) cannot described a single Slater determinant. Electron correlation is also important in typical CDW such as BaBiO3 (on-site correlation). If the and phases have similar free energies, they are either connected by phase transition, or, if zero-point vibrations overlap sufficiently, mix quantum mechanically form new phase. It will shown, using very accurate chemical calculations that four-site Cu-O cluster has local energy minima for both phases. The properties of mixed those superconductor: electrons coupled pairs, move delocalized non-activated way, give current magnetic field equivalent to Meissner effect. (c) 2007 Elsevier B.V. All rights reserved.
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