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

Research output: Contribution to journalArticle

13 Scopus citations


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
Issue number9
StatePublished - 23 Mar 2012

Fingerprint Dive into the research topics of 'Spin-state transition in Ba <sub>2</sub>Co <sub>9</sub>O <sub>14</sub>'. Together they form a unique fingerprint.

  • Cite this

    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