Electronic phase transition in hollandite titanates BaxTi8 O16+δ

R. Murata, T. Sato, T. Okuda, Y. Horibe, H. Tsukasaki, S. Mori, N. Yamaguchi, K. Sugimoto, S. Kawaguchi, M. Takata, T. Katsufuji

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15 Citations (Scopus)


We studied the physical properties of hollandite titanates, BaxTi8O16+δ, which have double chains of edge-sharing TiO6 octahedra with d electrons in the t2g states. We found that there is an electronic phase transition at ∼220 K, at which various properties exhibit anomalies. This phase transition is characterized by a modulation in the TiO6 chains and a spectral weight transfer of over 2 eV in the optical conductivity spectrum, which are presumably caused by charge and orbital ordering of the Ti t2g electrons.

Original languageEnglish
Article number220408
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
Publication statusPublished - 2015 Dec 14


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