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Spin-Peierls lattice fluctuations and disorders in CuGeO\(_\mathsf{3}\) and its solid solutions

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Abstract.

The inorganic quasi-one dimensional (1D) S = 1/2 antiferromagnetic (AF) system CuGeO3 undergoes a 2nd order spin-Peierls (SP) phase transition at T SP = 14.2 K. In this study we present an X-ray synchrotron radiation investigation which confirms that the SP instability is announced by an important regime of pretransitional structural fluctuations which have been detected until 36 K. Furthermore we show that these fluctuations are 1D above 24 K, a feature expected for a structural instability triggered by the Cu2 + chains of spin 1/2. By extrapolating the thermal dependence of the correlation length in the chain direction, we show that formation of singlet dimers begins at about 50 K, a temperature that we identify as the mean field temperature of the SP chain. The critical nature of the pretransitional fluctuations does not change when low amounts (<1%) of non-magnetic dopants substitute either the Cu site (case of Zn and Mg) or the Ge site (case of Si and Al) of CuGeO3. However, the spatial extension of the fluctuations is considerably reduced when the magnetic dopant Ni substitutes the Cu site. In the SP ground state of doped materials we have been able to detect, in addition to the superlattice SP reflections previously observed, a very weak anisotropic diffuse scattering. We give evidences that this scattering originates from dopant-induced quasi-1D domains in which the dimerisation is perturbed. If we assume that each domain is limited by a soliton-antisoliton pair, pinned either on the substituent of the Cu site or by the deformation field induced by the substituent of the Ge site, we deduce that the soliton and antisoliton are separated by a distance of about \(L_{0}\sim 28{-}45\) Å, and that the soliton half width amounts to about \(\xi_{SP}\sim 16{-}20\) Å. With these numbers we are able to account for the rate of decrease of T SP as a function of the dopant concentration, and to deduce the critical concentration above which the long-range SP order vanishes. The overall size of the perturbed domains thus obtained, \(L_{0} + 2\xi_{SP}\sim 70\) Å, is comparable with the size of the magnetic inhomogeneities determined by muon spin spectroscopy in the AF phase of doped CuGeO3.

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Authors and Affiliations

  1. Laboratoire de Physique des Solides, CNRS-UMR 8502, Université Paris-Sud, bâtiment 510, 91405, Orsay Cedex, France

    J.-P. Pouget, S. Ravy & J. P. Schoeffel

  2. Laboratoire de Chimie de l’État Solide, CNRS-UMR 8648, Université Paris-Sud, bâtiment 414, 91405, Orsay Cedex, France

    G. Dhalenne & A. Revcolevschi

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  1. J.-P. Pouget
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Correspondence to J.-P. Pouget.

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Received: 22 December 2003, Published online: 8 June 2004

PACS:

71.27. + a Strongly correlated electron systems; heavy fermions - 61.72.Dd Experimental determination of defects by diffraction and scattering - 75.45. + j Macroscopic quantum phenomena in magnetic systems

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Pouget, JP., Ravy, S., Schoeffel, J.P. et al. Spin-Peierls lattice fluctuations and disorders in CuGeO\(_\mathsf{3}\) and its solid solutions. Eur. Phys. J. B 38, 581–598 (2004). https://doi.org/10.1140/epjb/e2004-00155-4

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