Double-exchange model: phase separation versus canted spins |
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Authors: | MYu Kagan DI Khomskii MV Mostovoy |
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Institution: | (1) P.L. Kapitza Institute for Physical Problems, Kosygina Street 2, 117334 Moscow, Russia, RU;(2) University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands, NL |
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Abstract: | We study the competition between different possible ground states of the double-exchange model with strong ferromagnetic exchange
interaction between itinerant electrons and local spins. Both for classical and quantum treatment of the local spins the homogeneous
canted state is shown to be unstable against a phase separation. The conditions for the phase separation into the mixture
of the antiferromagnetic and ferromagnetic/canted states are given. We also discuss another possible realization of the phase-separated
state: ferromagnetic polarons embedded into an antiferromagnetic surrounding. The general picture of a percolated state, which
emerges from these considerations, is discussed and compared with results of recent experiments on doped manganaties.
Received 17 March 1999 |
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Keywords: | PACS 75 10 -b General theory and models of magnetic ordering - 75 30 Mb Valence fluctuation Kondo lattice and heavy-fermion phenomena - 75 30 Kz Magnetic phase boundaries (including magnetic transitions metamagnetism etc ) |
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