Why a local moment induces an antiferromagnetic ordering: An RVB picture
  Based on a Gutzwiller projected BCS wavefunction, it is shown that a local S=1/2 moment is present around a vacancy site (zinc impurity) in a form of staggered magnetic moments, which is a direct consequence of the short-ranged resonating-valence-bond (RVB) pairing in the spin background. 
Tao Li, Qiang-Hua Wang, Zheng-Yu Weng, Fan Yang, and Fu-Chun Zhang