T. Schneider, M.H. Pedersen
Journal of Superconductivity
Results are presented and interpreted for the zero- and finite-temperature excitation spectrum of ferromagnetic Ising-Heisenberg chains, as probed by dynamic form factors. Finite-chain calculations demonstrate the occurrence of a thermally induced resonance centered around zero frequency, and a broadening of the magnon and two-magnon bound-state resonances at low T. The occurrence of bound states in the associated transitions demonstrates the failure of finite-order magnon perturbation theory. © 1981 The American Physical Society.
T. Schneider, M.H. Pedersen
Journal of Superconductivity
M. Baumberger, E. Stoll, et al.
Physical Review B
E. Stoll, T. Schneider
Solid State Communications
T. Schneider, M.P. Soerensen, et al.
EPL