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Origin of magnetoresistance in Ca: doped YIG
- Source :
- Physica Status Solidi (A) - Applications and Materials Science; March 2003, Vol. 196 Issue: 1 p189-192, 4p
- Publication Year :
- 2003
-
Abstract
- In order to find a microscopic origin of a strong anisotropy, shown by the magnetoresistance in Ca: doped YIG, we investigate a simple system of two hybridizing ironoxygen clusters with tetrahedral and octahedral symmetries, respectively. By applying a group-theoretical approach to the diagonalization of the Hubbard model with the Zeeman term included, we obtain energy levels and the orbital eigen-states for both the clusters. This is the point of departure for calculating the total probability of the charge transfer between the clusters. And, finally, the magnetoresistance, as a function of the external field, is found at room temperatures. As an origin of the anisotropy in the magnetoresistance, we suggest the symmetry of the orbital eigen-states of the clusters, which finds its reflection in a form of the orbital contribution to the magnetic moments of the clusters.
Details
- Language :
- English
- ISSN :
- 18626300 and 18626319
- Volume :
- 196
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Physica Status Solidi (A) - Applications and Materials Science
- Publication Type :
- Periodical
- Accession number :
- ejs4438142
- Full Text :
- https://doi.org/10.1002/pssa.200306383