Observation of a Kosterlitz-Thouless state at the spin-Peierls phase transition in

J. E. Lorenzo; L. P. Regnault; S. Langridge; C. Vettier; C. Sutter; G. Grübel; J. Souletie; J. G. Lussier; J. P. Schoeffel; J. P. Pouget; A. Stunault; D. Wermeille; G. Dhalenne; A. Revcolevschi

doi:10.1209/epl/i1999-00129-8

All issues

Volume 45 / No 1 (January I 1999)

Europhys. Lett., 45 1 (1999) 45-51

Abstract

Issue		Europhys. Lett. Volume 45, Number 1, January I 1999


Page(s)		45 - 51
Section		Condensed matter: structure, thermal and mechanical properties
DOI		https://doi.org/10.1209/epl/i1999-00129-8
Published online		01 September 2002

Europhys. Lett., 45 (1), pp. 45-51 (1999)

Observation of a Kosterlitz-Thouless state at the spin-Peierls phase transition in

J. E. Lorenzo¹^,2, L. P. Regnault³, S. Langridge¹, C. Vettier¹, C. Sutter¹, G. Grübel¹, J. Souletie⁴, J. G. Lussier⁵, J. P. Schoeffel⁶, J. P. Pouget⁶, A. Stunault¹, D. Wermeille¹, G. Dhalenne⁷ and A. Revcolevschi⁷

¹ European Synchrotron Radiation Facility - 38042 Grenoble Cedex, France
² Laboratoire de Cristallographie du CNRS - BP 166, 38042 Grenoble, France
³ CEA/Département de Recherche Fondamentale sur la Matière Condensée, Service de Physique Statistique, Magnétisme et Supraconductivité, Laboratoire de Magnétisme et Diffraction Neutronique, Centre d'Etudes Nucléaires - 38054 Grenoble Cedex 9, France
⁴ Centre de Recherche sur le Très Basses Temperatures BP 166, 38042 Grenoble, France
⁵ Department of Solid State Physics, Risø National Laboratory, DK-4000 Roskilde, Denmark
⁶ Laboratoire de Physique des Solides, CNRS, URA 02, Université Paris Sud, Bât. 510, 91405 Orsay, France
⁷ Laboratoire de Chimie des Solides, CNRS URA 446, Université Paris Sud, Bât. 414, 91405 Orsay, France

Received: 28 July 1998
Accepted: 2 November 1998

Abstract

We present the results of a high-resolution X-ray-scattering study of the order parameter critical exponent, β, at the spin-Peierls phase transition in . As expected from previous X-ray data, there is a crossover from a 3D to a 2D regime, and the critical exponents in both regimes agree well with the values predicted for an n=2, XY order parameter. The consequence of the presence of new topological magnetic excitations onto the spin excitation spectrum is discussed.

PACS: 64.60.Fr – Equilibrium properties near critical points, critical exponents / 61.10.Eq – X-ray scattering (including small-angle scattering)

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