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Título:
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Phase diagram of the bosonic double-exchange model
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Autores:
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Alonso, J. L. ;
Cruz, A. ;
Fernández Pérez, Luis Antonio ;
Jiménez, S. ;
Martín Mayor, Víctor ;
Ruiz-Lorenzo, J. J. ;
Tarancón, A.
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Tipo de documento:
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texto impreso
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Editorial:
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American Physical Society, 2005-01-14
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física
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Materia = Ciencias: Física: Física-Modelos matemáticos
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Tipo = Artículo
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Resumen:
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The phase diagram of the simplest approximation to double-exchange systems, the bosonic double-exchange model with antiferromagnetic (AFM) superexchange coupling, is fully worked out by means of Monte Carlo simulations, large-N expansions, and variational mean-field calculations. We find a rich phase diagram, with no first-order phase transitions. The most surprising finding is the existence of a segmentlike ordered phase at low temperature for intermediate AFM coupling which cannot be detected in neutron-scattering experiments. This is signaled by a maximum (a cusp) in the specific heat. Below the phase transition, only short-range ordering would be found in neutron scattering. Researchers looking for a quantum critical point in manganites should be wary of this possibility. Finite-size scaling estimates of critical exponents are presented, although large scaling corrections are present in the reachable lattice sizes.
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En línea:
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https://eprints.ucm.es/38466/1/Fern%C3%A1ndezP%C3%A9rezLuisAntonio31LIBRE.pdf
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