Effect of impurities on quasi-two-dimensional quantum antiferromagnet

A. L. Chernyshev*, Yu-Chang Chen, A. H. Castro Neto

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We have studied the static and dynamic properties of quasi-two-dimensional (2D) quantum antiferromagnets (AFs) diluted with spinless impurities using spin-wave theory and T-matrix approximation. We show that the spectrum of a 2D AF at long wavelengths is overdamped at an arbitrary concentration of spinless impurities. The scattering leads to a length scale l/a∼e π/4x, x being impurity concentration and a the lattice spacing, beyond which the influence of impurities on the spectrum is dominant. Although the dynamical properties are significantly modified we show that 2D is not the lower critical dimension for this problem. Thus, in low-dimensional systems with disorder the connection between static and dynamic quantities is not straightforward. Our results are in quantitative agreement with the recent Monte Carlo simulations and experimental data for S=1/2, S=1, and S=5/2. We have also proposed experiments which can further test the results of our theory.

Original languageEnglish
Pages (from-to)8387-8389
Number of pages3
JournalJournal of Applied Physics
Volume91
Issue number10 I
DOIs
StatePublished - 15 May 2002

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