Spiral Charge Frustration in the Molecular Conductor (DIDCNQI)2Ag

Hitoshi Seo and Yukitoshi Motome
Phys. Rev. Lett. 102, 196403 – Published 15 May 2009

Abstract

We theoretically study the effect of spiral-type charge frustration in a quasi-one-dimensional molecular conductor (DIDCNQI)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 et al., Phys. Rev. Lett. 98, 066402 (2007)]. 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.

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  • Received 25 December 2008

DOI:https://doi.org/10.1103/PhysRevLett.102.196403

©2009 American Physical Society

Authors & Affiliations

Hitoshi Seo1,* and Yukitoshi Motome2

  • 1Synchrotron Radiation Research Center, Japan Atomic Energy Agency, SPring-8, Hyogo 679-5148, Japan
  • 2Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan

  • *Present address: Condensed Matter Theory Laboratory, RIKEN, Saitama 351-0198, Japan.

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Vol. 102, Iss. 19 — 15 May 2009

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