Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-11-24
J. Appl. Phys. 91, 8387 (2002).
Physics
Condensed Matter
Strongly Correlated Electrons
RevTeX, 3 pages, 3 figures, Proceedings of the 46 Conference on Magnetism and Magnetic Materials, Seattle 2001, to be publishe
Scientific paper
10.1063/1.1456911
We have studied the static and dynamic properties of quasi-two-dimensional quantum antiferromagnets (AF) 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 arbitrary concentration of spinless impurities. The scattering leads to a new length scale $\ell/a \sim e^{\pi/4x}$, $x$ 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.
Castro Neto Antonio H.
Chen Ya-Chen
Chernyshev Alexander L.
No associations
LandOfFree
Effect of impurities on quasi-2D quantum antiferromagnet does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Effect of impurities on quasi-2D quantum antiferromagnet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effect of impurities on quasi-2D quantum antiferromagnet will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-30759