Spin-state transition in Ba 2Co 9O 14

J. G. Cheng*, J. S. Zhou, Z. Hu, M. R. Suchomel, Y. Y. Chin, C. Y. Kuo, H. J. Lin, J. M. Chen, D. W. Pi, C. T. Chen, T. Takami, L. H. Tjeng, J. B. Goodenough

*Corresponding author for this work

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Abstract

Ba 2Co 9O 14 is a charge-ordered Co2 +/3 + cobaltite that consists of building blocks of CdI 2-type Co2 +/3 +O 6/3 layers, face-shared Co3 + 3O 12 octahedral trimers, and corner-sharing Co2 +O 4 tetrahedra. The Co-L 2,3 x-ray absorption spectroscopy spectrum at room temperature indicates a high and a low spin state for Co2 + and Co3 + ions, respectively. Measurements of high-temperature resistivity and thermoelectric power revealed an insulator-to-insulator phase transition at T t = 570 K, above which the inverse magnetic susceptibility χ -1(T) deviates from the Curie-Weiss law. By using a combination of soft x-ray absorption spectroscopy at the O-K edge and high-resolution synchrotron x-ray powder diffraction measurements on crossing T t, we have successfully determined the origin of this phase transition as a low-to-higher spin-state transition of Co3 + ions within the face-shared Co 3O 12 octahedral trimers in Ba 2Co 9O 14.

Original languageEnglish
Article number094424
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number9
DOIs
StatePublished - 23 Mar 2012

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    Cheng, J. G., Zhou, J. S., Hu, Z., Suchomel, M. R., Chin, Y. Y., Kuo, C. Y., Lin, H. J., Chen, J. M., Pi, D. W., Chen, C. T., Takami, T., Tjeng, L. H., & Goodenough, J. B. (2012). Spin-state transition in Ba 2Co 9O 14. Physical Review B - Condensed Matter and Materials Physics, 85(9), [094424]. https://doi.org/10.1103/PhysRevB.85.094424