Spin Dependence of Correlations in Two-Dimensional Square-Lattice Quantum Heisenberg Antiferromagnets
Abstract
We present a series expansion study of spin- S square-lattice Heisenberg antiferromagnets. The numerical data are in excellent agreement with recent neutron scattering measurements. Our key result is that the correlation length ξ for S>1/2 strongly deviates from the exact T-->0 (renormalized classical) scaling prediction for all experimentally and numerically accessible temperatures. We note basic trends with S of the experimental and series expansion correlation length data and propose a sequence of crossovers from renormalized classical to classical to Curie-Weiss regimes to explain them.
- Publication:
-
Physical Review Letters
- Pub Date:
- July 1995
- DOI:
- 10.1103/PhysRevLett.75.938
- arXiv:
- arXiv:cond-mat/9503143
- Bibcode:
- 1995PhRvL..75..938E
- Keywords:
-
- Condensed Matter
- E-Print:
- 5 pages, REVTeX file. PostScript file for the paper with embedded figures available via WWW at http://xxx.lanl.gov/ps/cond-mat/9503143 .