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Título:
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Discontinuous transitions in double-exchange materials
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Autores:
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Alonso, J. L. ;
Fernández Pérez, Luis Antonio ;
Guinea, F ;
Laliena, V. ;
Martín Mayor, Víctor
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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, 2001-02-01
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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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It is shown that the double-exchange Hamiltonian, with weak antiferromagnetic interactions, has a rich variety of first-order transitions between phases with different electronic densities and/or magnetizations. The paramagnetic-ferromagnetic transition moves towards lower temperatures, and becomes discontinuous as the relative strength of the double-exchange mechanism and antiferromagnetic coupling is changed. This trend is consistent with the observed differences between compounds with the same nominal doping, such as La_(2/3)Sr_(1/3)MnO_(3) and La_(2/3)Ca_(1/3)MnO_(3). Our results suggest that, in the low doping regime, a simple magnetic mechanism suffices to explain the main features of the phase diagram.
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En línea:
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https://eprints.ucm.es/40079/1/Fern%C3%A1ndezP%C3%A9rezLuisAntonio38LIBRE.pdf
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