Ferromagnetic polarons in the one-dimensional double and super-exchange model
- 作者：E. Vallejo ; F. Ló ; pez-Urí ; as ; O. Navarro ; M. Avignon
- 关键词：Manganites ; Double and super-exchange model ; Classical spin models ; Polarons ; Phase separation
- 刊名：Journal of Magnetism and Magnetic Materials
- 出版年：2008
- 期刊代码：31_03048853
- 类别：ph
- 出版时间：July 2008
- 卷：320
- 期：14
- 页码：e425-e427
- 文件大小：399 K
摘要
We present an analytical and numerical study of the competition between double and super-exchange (SE) interactions with classical localized spins interacting with itinerant electrons in a one-dimensional (1D) model. A phase separation between ferromagnetic (F) and anti-ferromagnetic (AF) phases was found at low SE interaction energy. The F–AF phase separation consists of a large F polaron within an AF background. For large SE interaction energy, the conduction electrons are self-trapped within separate small magnetic polarons. These magnetic polarons contain a single electron inside two or three sites forming a Wigner crystal. A new phase separation is found between these small polarons and the AF phase.