Magnetic Excitations in quasi two-dimensional Spin-Peierls Systems

Abstract

A study is presented of a two-dimensional frustrated and dimerized quantum spin-system which models the effect of inter-chain coupling in a spin-Peierls compound. Employing a bond-boson method to account for quantum disorder in the ground state the elementary excitations are evaluated in terms of gapful triplet modes. Results for the ground state energy and the spin gap are discussed. The triplet dispersion is found to be in excellent agreement with inelastic neutron scattering data in the dimerized phase of the spin-Peierls compound CuGeO_3. Moreover, consistent with these neutron scattering experiments, the low-temperature dynamic structure factor exhibits a high-energy continuum split off from the elementary triplet mode.

8 pages, Revtex, 8 eps-figures

References in corpus (3)

• Experimental evidence for a spin-Peierls-transition in ${\alpha }^{\prime }-Na{V}_2{O}_5$
• Double gap and solitonic excitations in the spin-Peierls chain CuGeO3
• Symmetry and dimension of the magnon dispersion of inorganic spin-Peierls systems

Cited by in corpus (6)

• Magnon splitting induced by charge ordering in NaV_2O_5
• Non-linear bond-operator theory and 1/d expansion for coupled-dimer magnets I: Paramagnetic phase
• Thermal drag in spin ladders coupled to phonons
• Magnetism of a tetrahedral cluster-chain
• The spin-Peierls instability in spin 1/2 XY chain in the non adiabatic limit
• Exact staggered dimer ground state and its stability in a two-dimensional magnet