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Phys. Rev. B 76, 205101 (2007) [6 pages]

Effect of cooling rate on charge ordering in θ-(BEDT-TTF)2RbZn(SCN)4

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F. Nad
Institut Néel, CNRS-UJF, Bâtiment E, 25 rue des martyrs, Boîte Postale 166, 38042 Grenoble Cedex 9, France and Institut of Radioengineering and Electronics, RAS, Mokhovaya 11/7, 125009 Moscow, Russia

P. Monceau
Institut Néel, CNRS-UJF, Bâtiment E, 25 rue des Martyrs, BP 166, 38042 Grenoble Cedex 9, France

H. M. Yamamoto
Condensed Molecular Materials Laboratories RIKEN, 2-1 Hirosawa Wako-shi, Saitama 351-0198, Japan

Received 18 April 2007; revised 13 July 2007; published 5 November 2007

We present results of measurements of the conductance and dielectric permittivity at various cooling and heating rates through the phase transition into the charge-ordered state in θ-(BEDT-TTF)2RbZn(SCN)4, [where BEDT-TTF is bis(ethylene-dithio)tetrathiafulvalene]. With increasing cooling rate, the sharpnesss of the first-order phase transition and the divergence of the dielectric permittivity associated with it are gradually suppressed. We explain the obtained results by the suggestion of combined contributions of electron and lattice subsystems to the formation of the charge-ordered state in two-dimensional organic compounds.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.205101
DOI:
10.1103/PhysRevB.76.205101
PACS:
71.20.Rv, 71.30.+h, 77.22.Ch
 
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