Phase separation in double exchange systems
强关联电子
2009-10-31 v1 材料科学
摘要
Ferromagnetic systems described by the double exchange model are investigated. At temperatures close to the Curie temperature, and for a wide range of doping levels, the system is unstable toward phase separation. The chemical potential decreases upon increasing doping, due to the significant dependence of the bandwidth on the number of carriers. The reduction of the electronic bandwidth by spin disorder leads to an enormously enhanced thermopower which peaks near T_c, with a sign opposite that predicted by a rigid band model.
引用
@article{arxiv.cond-mat/9805399,
title = {Phase separation in double exchange systems},
author = {Daniel P. Arovas and Guillermo Gomez-Santos and Francisco Guinea},
journal= {arXiv preprint arXiv:cond-mat/9805399},
year = {2009}
}
备注
4 pages, 2 encapsulated PostScript figures