Frustration from Localized Zhang-Rice States: A Unified Theory of Doping-Driven Magnetic Transitions in Cuprates
Doped holes in cuprates form localized Zhang-Rice singlets that act as active mediators of new magnetic interactions (J2 and J3). These emergent exchanges cause significant magnetic frustration, which rapidly destroys the antiferromagnetic order and drives the system into a spin-glass phase upon hole doping. This explains the observed magnetic electron-hole asymmetry.