Local Enhancement of Antiferromagnetic Correlations by Nonmagnetic Impurities

Details Local Enhancement of Antiferromagnetic Correlations by Nonmagnetic Impurities Local Enhancement of Antiferromagnetic Correlations by Nonmagnetic Impurities

1997-04-22

arxiv.org/abs/cond-mat/9704185v1

Phys Rev Lett 78, 3563 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 ps figures in the text, to appear on Phys. Rev. Lett. (received on 10/16/96)

Scientific paper

The local enhancement of antiferromagnetic correlations near vacancies observed in a variety of spin systems is analyzed in a single framework. Variational calculations suggest that the resonating-valence-bond character of the spin correlations at short distances is responsible for the enhancement. Numerical results for uniform spin chains, with and without frustration, dimerized chains, ladders, and two dimensional clusters are in agreement with our conjecture. This short distance phenomenon occurs independently of the long distance behavior of the spin correlations in the undoped system. Experimental predictions for a variety of compounds are briefly discussed.

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