Spin dependence of correlations in two-dimensional square-lattice quantum heisenberg antiferromagnets

N. Elstner, A. Sokol, R. R.P. Singh, M. Greven, R. J. Birgeneau

Research output: Contribution to journalArticlepeer-review

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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.

Original languageEnglish (US)
Pages (from-to)938-941
Number of pages4
JournalPhysical review letters
Volume75
Issue number5
DOIs
StatePublished - 1995

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