Why a local moment induces an antiferromagnetic ordering: An RVB picture
Tao Li, Qiang-Hua Wang, Zheng-Yu Weng, Fan Yang, Fu-Chun Zhang
Abstract
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.
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