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Impurity model for mixed-valent Mn3+/Mn4+ ions
- Title
- Impurity model for mixed-valent Mn3+/Mn4+ ions
- Authors
- Schlottmann P.; Lee K.-J.-B.
- Ewha Authors
- 이공주복
- SCOPUS Author ID
- 이공주복
- Issue Date
- 1997
- Journal Title
- Physical Review B - Condensed Matter and Materials Physics
- ISSN
- 0163-1829
- Citation
- Physical Review B - Condensed Matter and Materials Physics vol. 56, no. 21, pp. 13999 - 14005
- Indexed
- SCOPUS
- Document Type
- Article
- Abstract
- Intermediate valent tri- and tetravalent manganese ions play an important role in LaMnO3-based systems. We consider a Mn impurity with five orbitals in cubic symmetry which hybridize with conduction electrons. The exchange interaction in the d shell maximizes the impurity spin. We study the valence of the Mn impurity as a function of the splitting of the eg to t2g orbitals in zero magnetic field and for the totally spin-polarized state. The lifting of the degeneracy of the eg levels due to a small quadrupolar field, related to the Mn-O bond length or a Jahn-Teller effect, is also investigated. Possible implications on the magnetoresistance are discussed.
- Appears in Collections:
- 자연과학대학 > 물리학전공 > Journal papers
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