Физика Низких Температур: Том 27, Выпуск 9-10 (Сентябрь 2001), c. 1053-1056    ( к оглавлению , назад )

Model for superconductivity in optimally doped electron cuprates

T. H. Geballe and B. Y. Moyzhes

Laboratory for Advanced Materials and Department of Applied Physics Stanford University, Stanford, CA 94305-4045
E-mail: geballe@stanford.edu

Received May 29, 2001

Аннотация

The very anomalous normal state properties and superconductivity of electron-doped supercon-ducting cuprates with the T* structure are discussed. The literature values of high mobilities for electrons and holes are explained by the electrons and holes existing in different layers. The annealing procedures necessary for superconductivity produce oxygen-vacancy negative-U pairing centers. The relative insensitivity of Tc to the annealing condition is attributed to stabilization of the chemical potential near the middle of the narrow oxygen band formed by oxygen vacancies where the electronic entropy is large.

PACS:
74.76.Bz -
72.15.Eb - Electrical and thermal conduction in crystalline metals and alloys
72.15.Gd - Galvanomagnetic and other magnetotransport effects (see also 75.47.-m Magnetotransport phenomena; materials for magnetotransport)
74.25.Fy - Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)