Bipolaronic superconductivity

作者：A. S. Alexandrov, J. Ranninger · 发表于：Physical review. B, Condensed matter · 年份：1981 · DOI：10.1103/physrevb.24.1164 · 被引用次数：285 · 研究领域：High-pressure geophysics and materials、Physics of Superconductivity and Magnetism、Advanced Condensed Matter Physics

Superconducting properties of narrow-band electrons are examined in the strong-coupling limit. It is shown that bipolarons (localized spatially nonoverlapping Cooper pairs) formed by strong electron-phonon interaction have under certain conditions superconducting properties which are characteristic of superfluid charged Bose systems. They represent an example of the "molecular" superconductivity proposed by Schafroth, Butler, and Blatt [Helv. Phys. Acta 30 93 (1957)]. The Meissner effect and the penetration depth of bipolaronic superconductors are examined. The relationship between Bardeen-Cooper-Schrieffer superconductors and bipolaronic ones is discussed.