Magnetic excitations and effects of magnetic fields on the spin-Peierls transition in CuGeO${}_3$

Abstract

We analyze the magnetic excitations of a spin-1/2 antiferromagnetic Heisenberg model with alternating nearest neighbor interactions and uniform second neighbor interactions recently proposed to describe the spin-Peierls transition in CuGeO${}_3$. We show that there is good agreement between the calculated excitation dispersion relation and the experimental one. We have also shown that this model reproduces satisfactorily the experimental results for the magnetization vs. magnetic field curve and its saturation value. The model proposed also reproduces qualitatively some features of the magnetic phase diagram of this compound and the overall behavior of the magnetic specific heat in the presence of applied magnetic fields.

12 pages Revtex v2.0 + 4 figures postscripts included

References in corpus (2)

• Study of the magnetic susceptibility in the spin-Peierls system CuGeO${}_3$
• Predictions for Neutron Scattering and Photoemission Experiments on CuGeO_3

Cited by in corpus (8)

• Soliton Approach to Spin-Peierls Antiferromagnets: Large-Scale Numerical Results
• Numerical Study of the Incommensurate Phase in Spin-Peierls Systems
• Rapid Suppression of the Spin Gap in Zn-doped CuGeO_3 and SrCu_2O_3
• Spin fluctuations in CuGeO${}_3$ probed by light scattering
• Temperature and magnetic field dependence of the lattice constant in spin-Peierls cuprate CuGeO_3 studied by capacitance dilatometry in fields up to 16 Tesla
• On the soliton width in the incommensurate phase of spin-Peierls systems
• From spinons to magnons in explicit and spontaneously dimerized antiferromagnetic chains
• Mixing of magnetic and phononic excitations in incommensurate Spin-Peierls systems