Narrow and Broad Solitons in the Antiferromagnetic Chains of CsCoCl3 and TMMC

  • J. P. Boucher
  • L. P. Regnault
  • A. Pires
  • J. Rossat-Mignod
  • Y. Henry
  • J. Bouillot
  • W. G. Stirling
  • J. P. Renard
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 54)

Abstract

The two quasi one-dimensional (10) compounds CsCoCl3 and (CH3)4NMnCl3 (TMMC) are almost ideal systems in which to study soliton excitations. Both they have antiferromagnetic (AF) couplings in the chains and at low temperature they exhibit an Ising symmetry favourable for the occurrence of solitons. This symmetry is an intrinsic property of CsCoCl3 while in TMMC it is achieved only by the application of an external magnetic field H perpendicular to the chains. In the 1D short range order regime two energetically equivalent configurations are expected for the spins. Solitons can be seen as Bloch walls separating ordered domains and allowing the spins to pass from one configuration to the other. In the case of a “strong” Ising symmetry (CsCoCl3) the walls are reduced to one lattice unit (“narrow” solitons) (Fig.1a), while in the case of a “weak” Ising symmetry (TMMC) the walls extend over several lattice units (10 to 30) (“broad” solitons) (Fig.lb). To maintain a paramagnetic state, these walls move rapidly along the chains,inducing characteristic fluctuations. As an example, the fluctuation spectrum for narrow solitons as predicted by J. VILLAIN [1] is shown in Fig.2. Depending on the wave vector q to be considered with respect to the inverse of the correlation length, K, two different types of fluctuations can be observed. For q* = ∣π−q∣K, we are concerned with the propagation of individual solitons (Soliton mode) while for q* k, we observe essentially the fluctuations of the ordered domains which show up as a mode (AF mode) centred at q = π. In the soliton model, the width Гq which measures the short range order is simply the soliton density ns :
$$\Gamma = k = 2{n_s}$$
(1)

Keywords

Soliton Sine Exter Maki TMMC 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1984

Authors and Affiliations

  • J. P. Boucher
    • 1
    • 2
  • L. P. Regnault
    • 3
  • A. Pires
    • 2
    • 4
  • J. Rossat-Mignod
    • 3
  • Y. Henry
    • 3
  • J. Bouillot
    • 5
  • W. G. Stirling
    • 5
  • J. P. Renard
    • 6
  1. 1.Equipe de Recherche CNRS 216France
  2. 2.Département de Recherche Fondamentale, RMLaboratoire d’Electronique et de Technologie de l’InformationGrenoble CedexFrance
  3. 3.Département de Recherche Fondamentale, DNLaboratoire d’Electronique et de Technologie de l’InformationGrenoble CedexFrance
  4. 4.Departamento de FisicaUniversidade de Minas GeraisBelo HorizonteBrazil
  5. 5.Institut Laue-LangevinGrenoble CedexFrance
  6. 6.Institut d’Electronique FondamentaleUniversité Paris IXOrsay CedexFrance

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