J. Phys. IV France
Volume 09, Numéro PR10, December 1999
International Workshop on Electronic Crystals
Page(s) Pr10-357 - Pr10-359
International Workshop on Electronic Crystals

J. Phys. IV France 09 (1999) Pr10-357-Pr10-359

DOI: 10.1051/jp4:19991095

X-ray structural study of 4kF Wigner crystal and 4kF Peierls state in DCNQI complex with 1/4 filled quasi one-dimensional band

Y. Nogami1, K. Oshima1, K. Hiraki2 and K. Kanoda3

1  Department of Physics, Okayama University, 3-1-1 Tsushimanaka, Okayama 700-8530, Japan
2  Department of Physics, Gakushuin University, 1-5-1 Mejiro, Toshima, Tokyo 171-8588, Japan
3  Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan

Using newly developed X-ray low temperature camera, 4kF periodic modulation was observed in organic quasi one-dimensional(Q1D) compounds (DMe-DCNQI)2Ag(abbreviated as DMe) and (DI-DCNQI)2Ag (abbreviated as DI). From 4kF satellite reflection intensity distribution in q-space, periodic molecular displacement in DMe and periodic molecular deformation possibly related with molecular valence ordering in DI were found. These modulation patterns suggest occurrence of 4kF bond CDW in DM and 4kF site CDW in DI. The 4kF site CDW possibly caused by a marked intersite correlation V, can be interpreted as a Wigner crystal.

© EDP Sciences 1999