Susceptibility of the 2D S=1/2 Heisenberg antiferromagnet with an impurity

Details Susceptibility of the 2D S=1/2 Heisenberg antiferromagnet with an impurity Susceptibility of the 2D S=1/2 Heisenberg antiferromagnet with an impurity

2003-02-13

arxiv.org/abs/cond-mat/0302273v3

Phys. Rev. Lett. 91, 077204 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, v2: Updated data in figures, minor changes in text, v3: Final version, cosmetic changes

Scientific paper

10.1103/PhysRevLett.91.077204

We use a quantum Monte Carlo method (stochastic series expansion) to study the effects of a magnetic or nonmagnetic impurity on the magnetic susceptibility of the two-dimensional Heisenberg antiferromagnet. At low temperatures, we find a log-divergent contribution to the transverse susceptibility. We also introduce an effective few-spin model that can quantitatively capture the differences between magnetic and nonmagnetic impurities at high and intermediate temperatures.

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