1993/12/09 by Michael Teitelman, Teitelman, Michael
Physics and Astronomy · #Condensed Matter (cond-mat) #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Theory (hep-th) #Quantum and electron transport phenomena #Quantum many-body systems #Theoretical and Computational Physics #cond-mat #hep-lat #hep-th
paper · pdf · doi:10.48550/arxiv.cond-mat/9312038
6 pages, REVTEX
arxiv created 1993/12/09 · openalex publication_date 1993/12/09 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The low-temperature free energy of the spin S quantum Heisenberg ferromagnetic chain in a strong magnetic field is obtained in a two-particle approximation by using exact solution of two-spin-wave problem. The result is beyond the perturbation theory because it incorporates the both bound and scattering state contributions, and the scattering effect is essential as well as the bound state one. In particular the main temperature renormalization of an exchange constant is found to be linear in temperature instead T3/2 corresponded to the perturbation theory result.