Volume 75, Number 2, July 2006
|Page(s)||301 - 307|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||14 June 2006|
Self-organization of charge under pressure in the organic conductor
Laboratoire de Physique des Solides, UMR8502 - Bat. 510, Centre Universitaire F-91405 Orsay Cédex, France
2 Department of Chemistry, H.C. Oersted Institute - Univeristetsparken 5 DK-2100, Copenhagen, Denmark
Accepted: 24 May 2006
presents a phase coexistence between two anion orderings defined by their wave vectors and in a wide range of pressure (8–11) and temperature. From the determination of the anisotropy of the conductivity and the superconducting transitions in this regime we were able to extract the texture which results from a self-organization of the orientations of the anions in the sample. At the lowest pressures, the metallic parts, related to the q3 order, form droplets elongated along the a-axis embedded in the semiconducting matrix associated with the q2 order. Above 10, filaments along the a-axis extend from one end of the sample to the other nearly up to the end of the coexistence regime. A mapping of the system into an anisotropic Ising lattice is satisfactory to analyze the data.
PACS: 74.70.Kn – Organic superconductors / 72.60.+g – Mixed conductivity and conductivity transitions / 72.80.Le – Polymers; organic compounds (including organic semiconductors)
© EDP Sciences, 2006
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