title: Tuning of the ground state in electron doped anthracene.
abstract: High quality bulk samples of anthracene (AN) doped with potassium (K) in 1 : 1 and 2 : 1 stoichiometries were successfully prepared by a method involving a room temperature solid-state mechanical diffusion process prior to intercalation reactions during heat treatment, and their physical properties were studied using both magnetic and optical measurements. The transfer of almost one electron from K to AN in K1(AN) was confirmed by SQUID and ESR measurements. A pronounced magnetic hump centered at 150 K associated with antiferromagnetic interactions was observed, which can most likely be interpreted in terms of on-site Coulomb repulsions of the Mott insulating states. Optical spectra of K1(AN) clearly showed the insulating states, as well as the electron occupation of the LUMO-derived band of AN. Our results demonstrated tuning of the ground state of a typical bulk hydrocarbon by alkali metal intercalation.
authors.affiliation: Department of Physics, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba, Sendai, Japan.
authors.forename: Quynh T N
authors.initials: QT
authors.lastname: Phan
authors.forename: Satoshi
authors.initials: S
authors.lastname: Heguri
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Tanabe
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Shimotani
authors.forename: Takehito
authors.initials: T
authors.lastname: Nakano
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Nozue
authors.forename: Katsumi
authors.initials: K
authors.lastname: Tanigaki