X-ray scattering from Co0.83[Pt(C2O4]2]·6H2O: A system with two coupled order parameters |
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| Authors: | Aleksander Braude Asger Lindegaard-Andersen Kim Carneiro Allan E Underhill |
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| Affiliation: | Laboratory of Applied Physics III, Technical University of Denmark, DK-2800 Lyngby Denmark;Physics Laboratory I, H.C. Oersted Institute, Universitetsparken 5, DK-2100 Copenhagen Denmark;School of Physical and Molecular Sciences, University College of North Wales, Bangor, Gwynedd Gt. Britain |
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| Abstract: | X-ray studies of the quasi-one-dimensional conductor Co0.83 Pt(C2O4)2]·6H2O, Co(def)OP, show both a Peierls distortion with a period of 2kF = 1.70·2π/c and a separate (earlier reported) three-dimensional superlattice. The two distortions couple, so that the drastic decrease in electrical conductivity is accompanied by the occurence of the superlattice spots with a common critical temperature, T = (297 ± 4)K. The striking differences between Co(def)OP and Mg(def)OP are discussed and explained in terms of the different atomic structures of the cations. |
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