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oai:recercat.cat:2445/106352025-11-19T20:33:58Zcom_2072_1057col_2072_478796col_2072_478917

Charge and Zener polaron order in Bi0.75Sr0.25MnO3 Frontera Beccaria, Carlos García Muñoz, José Luis Aranda, Miguel A. G. Hervieu, Maryvonne Ritter, Clemens Mañosa, Lluís Garcia Capdevila, Xavier Calleja Lázaro, Alberto Estructura electrònica Química quàntica Electrònica quàntica Electronic structure of bulk materials Quantum electronics 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. 2009-12-29T10:58:44Z 2009-12-29T10:58:44Z 2003 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0163-1829 https://hdl.handle.net/2445/10635 538985 eng Reproducció digital del document publicat en format paper, proporcionada per PROLA i https://doi.org/10.1103/PhysRevB.68.134408 Physical Review B, 2003, vol. 68, núm. 13, p. 134408-1-134408-9 https://doi.org/10.1103/PhysRevB.68.134408 (c) The American Physical Society, 2003 info:eu-repo/semantics/openAccess 8 p. application/pdf application/pdf The American Physical Society Articles publicats en revistes (Ciència dels Materials i Química Física)