title: Spiral charge frustration in the molecular conductor (DI-DCNQI)2Ag.
abstract: We theoretically study the effect of spiral-type charge frustration in a quasi-one-dimensional molecular conductor (DI-DCNQI)2Ag. We clarify how the spiral frustration in the interchain Coulomb repulsion is relieved and leads to a self-organization of complex charge-lattice ordered chains, in agreement with the recent synchrotron x-ray study [T. Kakiuchi, Phys. Rev. Lett. 98, 066402 (2007)10.1103/PhysRevLett.98.066402]. In addition, we find that a keen competition between charge and lattice degrees of freedom under the frustration gives rise to a characteristic temperature within the ordered phase, below which a drastic growth of molecular displacements occurs. Our results enlighten the relevance of the spiral frustration and provide a possible reconciliation among puzzling experimental data.
authors.affiliation: Synchrotron Radiation Research Center, Japan Atomic Energy Agency, SPring-8, Hyogo 679-5148, Japan.
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Seo
authors.forename: Yukitoshi
authors.initials: Y
authors.lastname: Motome