Interrelation of the magnetic structure and the band insulating state in doped manganites
| Autor: | V. V. Deriglazov, S. M. Dunaevsky |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Magnetic structure Magnetic moment Solid-state physics Condensed matter physics Band gap Condensed Matter Physics Manganite Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Paramagnetism Zigzag Antiferromagnetism Condensed Matter::Strongly Correlated Electrons |
| Zdroj: | Physics of the Solid State. 52:904-906 |
| ISSN: | 1090-6460 1063-7834 |
| Popis: | The interrelation between the magnetic structure and the band insulating state in doped La1 − xCaxMnO3 manganites has been discussed. An analysis of various zigzag chains has revealed that, in the one-dimensional spectrum of eg electrons of these compounds, there always appear a number of band gaps, which at certain electron concentrations x support the formation of an insulating state in the corresponding three-dimensional antiferromagnetic structures. Apart from the well-known spectra of chains of the type (1 × 1) (magnetic E-structure) and (2 × 2) (magnetic CE-structure), we have obtained for the first time the spectrum of a (3 × 3) zigzag chain, whose three-dimensional unit cell contains 24 manganese atoms and provides a qualitatively correct fit to the magnetic structure of the La1/3Ca2/3MnO3 manganite. As follows from our analysis, the formation of a magnetic structure in this manganite should also be accompanied by the generation of a spontaneous magnetic moment. |
| Databáze: | OpenAIRE |
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