Spin state and structural changes at the metal-insulator transition in YBaCo2O5.5 by synchrotron x-rays

Synchrotron x-ray diffraction and absorption, together with magnetic and thermoelectric measurements, have been used to investigate the mechanism driving the metal to insulator transition in YBaCo2O5.50. Results show a structural and magnetic transition concomitant with the metal to insulator transi...

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Bibliographic Details
Published in:Journal of applied physics 2012-04, Vol.111 (7)
Main Authors: Padilla-Pantoja, J., Frontera, C., Herrero-Martín, J., García-Muñoz, J. Luis
Format: Article
Language:English
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Summary:Synchrotron x-ray diffraction and absorption, together with magnetic and thermoelectric measurements, have been used to investigate the mechanism driving the metal to insulator transition in YBaCo2O5.50. Results show a structural and magnetic transition concomitant with the metal to insulator transition. Absorption spectroscopy at the Co L3 edge as a function of temperature reveals minor changes across the transition. The set of experimental results are hardly conciliative with a high to low spin state change of Co ions at octahedral sites in this cobaltite.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3673831