Electronic structure of zigzag ferromagnetic chains and conditions for the existence of insulating state in manganites
| Autor: | S. M. Dunaevsky, V. V. Deriglazov |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Materials science
Solid-state physics Spins Condensed matter physics Electronic structure Condensed Matter Physics Manganite Spectral line Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Zigzag Ferromagnetism Antiferromagnetism Condensed Matter::Strongly Correlated Electrons |
| Zdroj: | Physics of the Solid State. 50:101-107 |
| ISSN: | 1090-6460 1063-7834 |
| DOI: | 10.1134/s1063783408010198 |
| Popis: | The tight-binding method and the double-exchange Hamiltonian with infinite on-site Hund interaction are used to calculate the spectrum of eg electrons in manganites for various magnetic structures composed of ferromagnetic zigzag spin chains that have two to eight spins per one-dimensional unit cell. The values of the carrier concentration x are found at which the band insulator state can arise in antiferromagnetic manganites La1 − xCaxMnO3 containing the above chains. In addition to the known spectra of (1 × 1) and (2 × 2) chains, the spectrum of a (3 × 3) zigzag chain is obtained for the first time. A three-dimensional unit cell consisting of this type of chains and having 24 manganese atoms permits a correct qualitative description of the atomic and magnetic structures of the manganite La1/3Ca2/3MnO3. |
| Databáze: | OpenAIRE |
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