J. Phys. IV France 09 (1999) Pr10-357-Pr10-359
X-ray structural study of 4kF Wigner crystal and 4kF Peierls state in DCNQI complex with 1/4 filled quasi one-dimensional bandY. 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