Título:
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Charge and Zener polaron order in Bi0.75Sr0.25MnO3
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Autor/a:
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Frontera Beccaria, Carlos; García Muñoz, José Luis; Aranda, Miguel A. G.; Hervieu, Maryvonne; Ritter, Clemens; Mañosa, Lluís; Garcia Capdevila, Xavier; Calleja Lázaro, Alberto
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Otros autores:
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Universitat de Barcelona |
Abstract:
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We have characterized the RT structure of Bi0.75Sr0.25MnO3 by means of electron diffraction, synchrotron
x-ray, and neutron powder diffraction. These data evidence that a;b;A2ap and c;2ap average structure
presents a modulation that doubles the a and c lattice parameters. The temperature evolution of this compound
above RT has been investigated using magnetization, calorimetry measurements, and neutron powder diffraction.
These data reveal that the superstructure disappears above ;575 K where a structural transition takes
place. Susceptibility data show that, concomitant to the formation of the superstructure ~on cooling!, there is an
enhancement of the effective paramagnetic moment as has also been found in other Bi-(Sr,Ca)MnO3 bismuth
manganites. The observed features and cell evolution signals that a new type of charge and polaron ordering
occurs at this composition. |
Materia(s):
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-Estructura electrònica -Química quàntica -Electrònica quàntica -Electronic structure of bulk materials -Quantum electronics |
Derechos:
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(c) The American Physical Society, 2003
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Tipo de documento:
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Artículo Artículo - Versión publicada |
Editor:
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The American Physical Society
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