1998/10/31 by R. Werner, C. Gros, M. Braden · 1 citation
Physics and Astronomy · #cond-mat
paper · pdf · doi:10.1103/physrevb.59.14356
published as Phys. Rev. B, Vol. 59, 14 356 (1999) · 11 pages, two figures, 13 tables, PRB 59 (in press)
arxiv created 1999/04/26 · arxiv updated 2009/11/30
Using RPA results, mean field theory, and refined data for the polarization vectors we determine the coupling constants of the four Peierls-active phonon modes to the spin chains of CuGeO3. We then derive the values of the coupling of the spin system to the linear ionic displacements, the bond lengths and the angles between bonds. Our values are consistent with microscopic theories and various experimental results. We discuss the applicability of static approaches to the spin-phonon coupling. The c-axis anomaly of the thermal expansion is explained. We give the values of the coupling constants in an effective one-dimensional Hamiltonian.