Microscopic origin of local moments in a zinc-doped high-$T_{c}$ superconductor

Details Microscopic origin of local moments in a zinc-doped high-$T_{c}$ superconductor Microscopic origin of local moments in a zinc-doped high-$T_{c}$ superconductor

2004-05-28

arxiv.org/abs/cond-mat/0405664v2

Phys. Rev. B 71, 184507 (2005)

Physics

Condensed Matter

Superconductivity

The topological reason of local moment formation is given. One figure is added

Scientific paper

10.1103/PhysRevB.71.184507

The formation of a local moment around a zinc impurity in the high-$T_{c}$ cuprate superconductors is studied within the framework of the bosonic resonating-valence-bond (RVB) description of the $t-J$ model. A topological origin of the local moment has been shown based on the phase string effect in the bosonic RVB theory. It is found that such an $S=1/2$ moment distributes near the zinc in a form of staggered magnetic moments at the copper sites. The corresponding magnetic properties, including NMR spin relaxation rate, uniform spin susceptibility, and dynamic spin susceptibility, etc., calculated based on the theory, are consistent with the experimental measurements. Our work suggests that the zinc substitution in the cuprates provide an important experimental evidence for the RVB nature of local physics in the original (zinc free) state.

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