Nonadiabatic Approach to Spin-Peierls Transitions via Flow Equations

Details Nonadiabatic Approach to Spin-Peierls Transitions via Flow Equations Nonadiabatic Approach to Spin-Peierls Transitions via Flow Equations

1998-01-19

arxiv.org/abs/cond-mat/9801185v2

Phys. Rev. B 57, R14004 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.57.R14004

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.

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