Local Enhancement of Antiferromagnetic Correlations by Nonmagnetic Impurities

@inproceedings{Martins1997LocalEO,
  title={Local Enhancement of Antiferromagnetic Correlations by Nonmagnetic Impurities},
  author={George Balster Martins and Markus Laukamp and J. Torres Riera and E. Dagotto},
  year={1997}
}
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 resonatingvalence-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… CONTINUE READING