Volume 44, Number 4, November II 1998
|Page(s)||511 - 517|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Neutron-scattering study of the commensurate-incommensurate transition under field in Si-doped spin-Peierls systems
Institut d'Electronique Fondamentale, CNRS URA 22, Université Paris-Sud, Bât. 220, 91405 Orsay cedex, France
2 Département de Recherche Fondamentale sur la Matière Condensée, SPSMS/MDN CEN-G - 38054 Grenoble cedex 9, France
3 Laboratoire de Cristallographie, CNRS - Boîte Postale 166, 38043 Grenoble, France
4 Laboratoire Louis Néel, CNRS - Boîte Postale 166, 38043 Grenoble, France
5 Institut Laue Langevin - BP156, 38042 Grenoble cedex 9, France
6 Laboratoire de Chimie des Solides, CNRS URA 446, Université Paris-Sud, Bât. 414, 91405 Orsay cedex, France
Accepted: 1 October 1998
We have studied the effects of an applied magnetic field on two silicon-doped spin-Peierls compounds with Si contents x = 0.003 and 0.007. For the first time by means of neutron diffraction, it has been possible to perform measurements above the critical field HC. In , a sharp commensurate-incommensurate transition is observed upon increasing field at . The transition is characterized by a large hysteresis cycle, and the experimental data are consistent with the soliton-lattice scenario. At higher doping (x=0.007), the superlattice reflections remain peaked at commensurate positions, evolving from a resolution-limited Gaussian lineshape at zero field to a quasi-Lorentzian one at 12 T. By measuring a series of characteristic superlattice peaks on both sides of the transition field in , we have been able to determine the lattice distortion in both the dimerized phase at 11 T and the incommensurate phase at 12 T.
PACS: 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.) / 75.10.Jm – Quantized spin models / 75.50.Ee – Antiferromagnetics
© EDP Sciences, 1998
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