Self-organization of charge under pressure in the organic conductor (TMTSF)2ReO4

(TMTSF)2ReO4 presents a phase coexistence between two anion orderings defined by their wave vectors q2 = (1/2,1/2,1/2) and q3 = (0,1/2,1/2) in a wide range of pressure (8-11 kbar) and temperature. From the determination of the anisotropy of the conductivity and the superconducting transitions in thi...

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Bibliographic Details
Published in:Europhysics letters Vol. 75; no. 2; pp. 301 - 307
Main Authors: Colin, C, Auban-Senzier, P, Pasquier, C. R, Bechgaard, K
Format: Journal Article
Language:English
Published: IOP Publishing 01-07-2006
European Physical Society / EDP Sciences / Società Italiana di Fisica / IOP Publishing
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Summary:(TMTSF)2ReO4 presents a phase coexistence between two anion orderings defined by their wave vectors q2 = (1/2,1/2,1/2) and q3 = (0,1/2,1/2) in a wide range of pressure (8-11 kbar) 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 ReO4- 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 kbar, 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.
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ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2006-10096-6