T. Schneider, E. Stoll
Physical Review Letters
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, E. Stoll
Physical Review Letters
T. Schneider, E. Stoll
Physical Review Letters
H.R. Jauslin, T. Schneider
Journal of Statistical Physics
T. Schneider, E. Pytte
Physical Review B