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Diffuse X-ray scattering in the metallic state of TSeF-TCNQ and HMTSeF-TCNQ |
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| Authors: | C. Weyl E.M. Engler K. Bechgaard G. Jehanno S. Etemad |
| Affiliation: | Laboratoire de Physique des Solides, Université Paris-Sud, 91405 Orsay, France;I.B.M. Thomas J. Watson Research Center, Yorktown Heights, NY 10598, U.S.A.;H.C. Oersted Institute, Universitetsparken 5, DK-2100 Copenhagen, Denmark;Servide de Physique du Solide et de Résonance Magnétique, Centre d''Etudes Nucléaires de Saclay, 91190 Gif-Sur-Yvette, France;Department of Physics, Aria-Mehr University, P.O. Box 3406, Tehran, Iran |
| Abstract: | Some results of a X-ray diffuse scattering investigation on the charge transfer compounds TSeFTCNQ and HMTSeF-TCNQ are reported. In the metallic region the results show the formation of a 1-D distortion or a Kohn anomaly in the phonon spectrum. For TSeFTCNQ this is observed below T ～ 238 K and corresponds to a periodicity of (3.15 ± 0.05) |b| along the chain axis. For HMTSeFTCNQ the distortion was detected even at room temperature and has a period of (2.7 ± 0.1) |b|. In both materials the distortion has both transverse components in contrast to TTFTCNQ. In the insulating state of TSeF-TCNQ below 29 K the 1-D distortions on each stack are correlated to form a 3-D superlattice. |
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