Volume 84, Number 2, October 2008
Article Number 26002
Number of page(s) 5
Section Condensed Matter: Structural, Mechanical and Thermal Properties
Published online 25 September 2008
EPL, 84 (2008) 26002
DOI: 10.1209/0295-5075/84/26002

Temperature and electric-current dependence of charge-ordered domains in $\theta$-(BEDT-TTF)2CsZn(SCN)4

T. Ito1, M. Watanabe2, K.-I. Yamamoto1, N. Ikeda1, Y. Nogami1, Y. Noda2, H. Mori3, T. Mori4 and I. Terasaki5

1   The Graduate School of Natural Science and Technology, Okayama University - Okayama 700-8530, Japan
2   Institute of Multidisciplinary Research for Advanced Materials, Tohoku University - Sendai 980-8577, Japan
3   The Institute for Solid State Physics, The University of Tokyo - Kashiwa 277-8581, Japan
4   Department of Organic and Polymeric Materials, Tokyo Institute of Technology - Tokyo 152-8552, Japan
5   Department of Applied Physics, Waseda University - Tokyo 169-8555, Japan

received 19 May 2008; accepted in final form 1 September 2008; published October 2008
published online 25 September 2008

We report X-ray diffraction measurements of the charge-ordered organic conductor $\theta$-(BEDT-TTF)2CsZn(SCN)4 at various temperatures with external currents. The two kinds of diffuse scattering observed at q1 = (2/3 k 1/3) and q2 = (0 k 1/2) exhibit remarkable difference in the interplane correlation along the b-axis, the temperature dependence, and the electric-current dependence. These observations suggest that the two diffuse scatterings come from spatially different charge-ordered domains. The external current melts the q2-type domains, which can control the competition of the two orders.

61.05.cp - X-ray diffraction.
61.66.Hq - Organic compounds.
72.20.Ht - High-field and nonlinear effects.

© EPLA 2008