Why a local moment induces an antiferromagnetic ordering: An RVB picture
Tao Li, Qiang-Hua Wang, Zheng-Yu Weng, Fan Yang, and Fu-Chun Zhang
TL;DR
This paper demonstrates that a local S=1/2 magnetic moment around a vacancy in a spin system induces antiferromagnetic order due to short-range RVB pairing, using a Gutzwiller projected BCS wavefunction.
Contribution
It introduces a theoretical framework linking local moments and antiferromagnetic order via RVB pairing in impurity-doped spin systems.
Findings
Local S=1/2 moments form around vacancies as staggered magnetic moments.
Short-range RVB pairing explains the emergence of antiferromagnetic order.
The Gutzwiller projected BCS wavefunction effectively models impurity effects.
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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