Volume 42, Number 5, June 1998
|Page(s)||541 - 546|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
A model for the doped copper oxide compounds
Departamento de Física Teórica, Universidad de
Zaragoza - 50009 Zaragoza, Spain
2 LPTHE, Université de Paris XI - 91405 Orsay Cedex, France
3 Departamento de Física Teórica I, Universidad Complutense de Madrid, 28040 Madrid, Spain
4 Swiss Center for Scientific Computing, ETH-Zürich, ETH-Zentrum CH-8092 Zürich, Switzerland
Accepted: 18 April 1998
We present a relativistic spin-fermion model for the cuprates, in which both the charge and spin degrees of freedom are treated dynamically. The spin-charge coupling parameter is associated with the doping fraction. The model is able to account for the various phases of the cuprates and their properties, not only at low and intermediate doping but also for (highly) over-doped compounds. In particular, we acquire a qualitative understanding of high-Tc superconductivity through Bose-Einstein condensation of bound charge pairs. The mechanism that binds these pairs does not require a Fermi sea.
PACS: 74.20.-z – Theories and models of superconducting state / 71.27.+a – Strongly correlated electron systems; heavy fermions / 74.25.Dw – Superconductivity phase diagrams
© EDP Sciences, 1998
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