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Manganites at low temperatures and light doping: band approach and percolation |
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| Authors: | L. P. Gor’kov V. Z. Kresin |
| Affiliation: | 1. National High Magnetic Field Laboratory, Florida State University, 32310, Tallahassee, FL, USA 2. L. D. Landau Institute of Theoretical Physics, 117334, Moscow, Russia 3. Lawrence Berkeley Laboratory, University of California, 94720, Berkeley, CA |
| Abstract: | A tight-band model is employed for thee 2g orbitals in manganites. It is shown that a large intra-atomic Hund couplingJ H and the resulting double-exchange mechanism lead to antiferromagnetic ordering along one of the cubic axes, stabilized by the cooperative Jahn-Teller effect, which further decreases the band energy, of the electrons. As a result, LaMnO3 is a band insulator built of 2D ferromagnetic layers. The critical concentration (x c ?0.16) for the onset of ferromagnetic and metallic behavior at low temperatures in La1?x Sr x MnO3 and the phase transition are treated in a percolation approach. |
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