Lattice Dimerization in the Spin-Peierls Compound CuGeO$_3$
B. B\"uchner, H. Fehske, A.P. Kampf, and G. Wellein
TL;DR
This paper investigates the structural and magnetic properties of CuGeO$_3$, revealing a minimum dimerization incompatible with adiabatic models and showing that spin-phonon interactions explain the observed spin excitation gap.
Contribution
It introduces a non-adiabatic approach to understanding lattice dimerization and spin gaps in CuGeO$_3$, emphasizing dynamical spin-phonon coupling effects.
Findings
Minimum magnetic dimerization of 3% incompatible with adiabatic models
Spin excitation gap aligns with predictions from dynamical spin-phonon coupling
Uniaxial pressure affects exchange coupling and structural distortion
Abstract
The uniaxial pressure dependences of the exchange coupling and the structural distortion in the dimerized phase of CuGeO are analyzed. A minimum magnetic dimerization of 3 % is obtained, incompatible with an adiabatic approach to the spin-Peierls transition. Exploring the properties of an Heisenberg spin chain with dynamical spin-phonon coupling, the dimerization dependence of the spin excitation gap is found to be in qualitative agreement with experiment.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.