Phase transitions and the role of vanadium t2g states in A V13 O18 (A=Sr,Ba )

M. Ikeda, Y. Nagamine, S. Mori, J. E. Kim, K. Kato, M. Takata, T. Katsufuji

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We studied A V13 O18 (A=Sr,Ba), in which V ions form a face-centered-cubic lattice with periodically missing ions. It was found that there is a phase transition in both SrV13 O18 (Tc =270 K) and BaV13 O18 (Tc =200 K), where anomalies are observed in resistivity and magnetic susceptibility. Resistivity shows a contrasting behavior in the low-temperature phase between SrV13 O18 (a metallic behavior) and BaV13 O18 (an insulating behavior). By synchrotron x-ray powder-diffraction measurement, it was found that V trimerization occurs at the phase transition of SrV13 O 18. On the other hand, BaV13 O18 does not show a large change in the x-ray powder diffraction but superlattice peaks at (0 1 2 1 2) was observed in the electron diffraction. Possible orbital states of the t2g electrons in the V ions are discussed.

Original languageEnglish
Article number104415
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
Publication statusPublished - 2010 Sept 10


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