Magnetic Excitations in the Spin-Peierls System CuGeO3
G. Bouzerar, A. P. Kampf, F. Schönfeld
Abstract
We have calculated the magnetic excitation spectrum in frustrated and dimerized spin 1/2 Heisenberg chains for model parameters which describe the thermodynamics and low frequency spin dynamics in the spin--Peierls system CuGeO3. As a test the chosen model is found to reproduce the lowest Raman excitation energy near 30 cm-1 in the dimerized phase. We establish the elementary triplet and singlet excitation branches below the continuum and estimate the interchain coupling effects on the dimerization parameter.
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