Application of an Extended Eliashberg Theory to High-T_c Cuprates

摘要

In recent years a unified phenomenological picture for the hole dopedhigh-T_c cuprates has emerged for a spin and charge spectroscopy. Spectralanomalies have been interpreted as evidence of charge carrier coupling to acollective spin excitation present in the optical conductivity, in ARPES(angular resolved photoemission), and in tunneling data. These anomalies can beused to derive an approximate picture of a charge carrier-exchange bosoninteraction spectral density I^2 chi(omega) which is then be used within anextended Eliashberg formalism to analyze normal and superconducting propertiesof optimally doped and overdoped cuprates. This paper reviews recentdevelopments and demonstrates the sometimes astonishing agreement betweenexperiment and theoretical prediction.