Observation of a Kosterlitz-Thouless state at the spin-Peierls phase transition in CuGeO3

Authors
Lorenzo, JE Regnault, LP Langridge, S Vettier, C Sutter, C Grubel, G Souletie, J Lussier, JG Schoeffel, JP Pouget, JP Stunault, A Wermeille, D Dhalenne, G Revcolevschi, A
Citation
Je. Lorenzo et al., Observation of a Kosterlitz-Thouless state at the spin-Peierls phase transition in CuGeO3, EUROPH LETT, 45(1), 1999, pp. 45-51
Citations number
24
Categorie Soggetti
Physics
Journal title
EUROPHYSICS LETTERS
ISSN journal
02955075 → ACNP
Volume
45
Issue
1
Year of publication
1999
Pages
45 - 51
Database
ISI
SICI code
0295-5075(19990101)45:1<45:OOAKSA>2.0.ZU;2-M
Abstract
We present the results of a high-resolution X-ray-scattering study of the o rder parameter critical exponent, beta, at the spin-Peierls phase transitio n in CuGeO3 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 consequenc e of the presence of new topological magnetic excitations onto the spin exc itation spectrum is discussed.