Volume 72, Number 1, October 2005
|Page(s)||117 - 123|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||26 August 2005|
Weak phase separation and the pseudogap in the electron-doped cuprates
Institut für Theoretische Physik - Computational Physics, Technische Universität Graz Petersgasse 16, A-8010 Graz, Austria
Accepted: 27 July 2005
We study the quantum transition from an antiferromagnet to a superconductor in a model for electron- and hole-doped cuprates by means of a variational cluster perturbation theory approach. In both cases, our results suggest a tendency towards phase separation between a mixed antiferromagnetic-superconducting phase at low doping and a pure superconducting phase at larger doping. However, in the electron-doped case the energy scale for phase separation is an order of magnitude smaller than for hole doping. We argue that this can explain the different pseudogap and superconducting transition scales in hole- and electron-doped materials.
PACS: 74.20.-z – Theories and models of superconducting state / 05.70.Jk – Critical point phenomena / 71.10.-w – Theories and models of many-electron systems
© EDP Sciences, 2005
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