Electron-phonon interaction in the new superconductors La2−x (Ba,Sr )x CuO4

作者：W. Weber · 发表于：Physical Review Letters · 年份：1987 · DOI：10.1103/physrevlett.58.1371 · 被引用次数：557 · 研究领域：Physics of Superconductivity and Magnetism、Magnetic and transport properties of perovskites and related materials、Advanced Condensed Matter Physics

A realistic tight-binding theory, based on the first-principles energy-band results of Mattheiss, is used to study the electron-phonon interaction in the new high-${\mathrm{T}}_{\mathrm{c}}$ superconductors ${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathrm{x}}$(Ba,Sr${)}_{\mathrm{x}}$${\mathrm{CuO}}_{4}$. The calculated results include the phonon dispersion curves, phonon linewidths, the Eliashberg function ${\mathrm{\ensuremath{\alpha}}}^{2}$(\ensuremath{\omega})F(\ensuremath{\omega}), and the interaction constant \ensuremath{\lambda}. A very strong couplin of specific O phonons to the conduction electrons is found (\ensuremath{\lambda}\ensuremath{\ge}2), leading---because of the light oxygen mass---to ${\mathrm{T}}_{\mathrm{c}}$ values of \ensuremath{\sim}30-40 K.