Nonadiabatic Approach to Spin-Peierls Transitions via Flow Equations

Abstract

The validity of the adiabatic approach to spin-Peierls transitions is assessed. An alternative approach is developed which maps the initial magneto-elastic problem to an effective magnetic problem only. Thus the equivalence of magneto-elastic solitons and magnetic spinons is shown. No soft phonon is required for the transition. Temperature dependent couplings are predicted in accordance with the analysis of experimental data.

Latex, 4 pages, Phys. Rev. B, Rap. Comm. in press final version containing some clarifications

References in corpus (3)

• Reexamination of the microscopic couplings of the quasi one-dimensional antiferromagnet CuGeO_3
• Double gap and solitonic excitations in the spin-Peierls chain CuGeO3
• Symmetry and dimension of the magnon dispersion of inorganic spin-Peierls systems

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