Lattice dimerization ia the spin-Peierls compound CuGeO3

Authors
Buchner, B Fehske, H Kampf, AP Wellein, G
Citation
B. Buchner et al., Lattice dimerization ia the spin-Peierls compound CuGeO3, PHYSICA B, 261, 1999, pp. 956-957
Citations number
7
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA B
ISSN journal
09214526 → ACNP
Volume
261
Year of publication
1999
Pages
956 - 957
Database
ISI
SICI code
0921-4526(199901)261:<956:LDITSC>2.0.ZU;2-V
Abstract
The uniaxial pressure dependence of the exchange coupling and the structura l distortion in the dimerized phase of CuGeO3 are analyzed. A minimum magne tic dimerization of 3% is obtained incompatible with an adiabatic approach to the spin-Peierls transition. Exploring the properties of an Heisenberg s pin chain with dynamical spin-phonon coupling, the dimerization dependence of the spin excitation gap is found to be in qualitative agreement with exp eriment. (C) 1999 Elsevier Science B.V. All rights reserved.