Long Range Dynamics Related to Magnetic Impurity in the 2D Heisenberg Antiferromagnet

Abstract

We consider a magnetic impurity in the two-dimensional Heisenberg antifferomagnet with long range antiferromagnetic order. At low temperature the impurity magnetic susceptibility has a Curie term ($\propto 1/T$) and a logarithmic correction ($\propto \ln (T)$). We calculate the correction and derive related Ward identity for the impurity-spin-wave vertex.

5 pages, 6 figures