title: Dimerization and charge order in hollandite K₂V₈O₁₆.
abstract: The metal-insulator transition occurring in hollandite K₂V₈O₁₆ has been studied by means of neutron and x-ray diffraction as well as by thermodynamic and electron-spin resonance measurements. The complete analysis of the crystal structure in the distorted phase allows us to identify dimerization as the main distortion element in insulating K₂V₈O₁₆. At low-temperature, half of the V chains are dimerized perfectly explaining the suppression of magnetic susceptibility due to the formation of spin singlets. The dimerization is accompanied by the segregation of charges into chains.
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.
authors.forename: A C
authors.initials: AC
authors.lastname: Komarek
authors.forename: M
authors.initials: M
authors.lastname: Isobe
authors.forename: J
authors.initials: J
authors.lastname: Hemberger
authors.forename: D
authors.initials: D
authors.lastname: Meier
authors.forename: T
authors.initials: T
authors.lastname: Lorenz
authors.forename: D
authors.initials: D
authors.lastname: Trots
authors.forename: A
authors.initials: A
authors.lastname: Cervellino
authors.forename: M T
authors.initials: MT
authors.lastname: Fernández-Díaz
authors.forename: Y
authors.initials: Y
authors.lastname: Ueda
authors.forename: M
authors.initials: M
authors.lastname: Braden