Eur. Phys. J. B 13, 11-14 (2000)
https://doi.org/10.1007/s100510050003

The correlation length of the Heisenberg antiferromagnet with arbitrary spin S

Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80309-0390, USA

Corresponding author: ^a hasenfra@itp.unibe.ch

Received: 9 February 1999
Published online: 15 January 2000

Abstract

Experiments and numerical data on the correlation length for large S disagree strongly with the theoretical prediction based on the effective field theory prescription of the magnon physics. The reason is that for large S, at any accessible , the cut-off effects from the non-magnon scales become large and can not be treated by an effective field theory. We study these effects in a spin-wave expansion. The corrected prediction on connects the renormalized classical and the classical scaling regions smoothly and comes close to the data.