title: Electronic phase transition and an anomalous ordered phase in Ba2Ti13O22 with 3d1 ions on a triangle-based lattice.
abstract: We found that Ba(2)Ti(13)O(22) with Ti(3+) (3d(1)) ions on a triangle-based lattice exhibits a phase transition at T(c)~200 K, below which the increase of electrical resistivity and decrease of magnetic susceptibility were observed. Transmission electron microscopy and optical reflectivity measurements indicate that the low-temperature phase of the present compound shares characteristics in common with a charge-density-wave state with remnant carriers, although a commensurate wave vector of the modulation and a linear temperature dependence of the magnetic susceptibility below T(c) suggest an exotic ordered state.
authors.affiliation: Department of Physics, Waseda University, Tokyo 169-8555, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Takayama
authors.forename: T
authors.initials: T
authors.lastname: Koyama
authors.forename: S
authors.initials: S
authors.lastname: Mori
authors.forename: K
authors.initials: K
authors.lastname: Kato
authors.forename: M
authors.initials: M
authors.lastname: Takata
authors.forename: J
authors.initials: J
authors.lastname: Fujioka
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura
authors.forename: J
authors.initials: J
authors.lastname: Miyazaki
authors.forename: T
authors.initials: T
authors.lastname: Katsufuji