Experimental Evidence for Topological Doping in the Cuprates

TL;DR

This paper discusses experimental evidence supporting topological doping in cuprate superconductors, highlighting charge segregation and the origin of scattering related to resonance peaks, which are attributed to Cu spins rather than doped holes.

Contribution

It provides experimental support for the concept of topological doping and clarifies the origin of scattering in cuprates, emphasizing charge segregation and spin contributions.

Findings

Resonance peak scattering originates from Cu spins.

Charge segregation is consistent with experimental data.

Supports topological doping as a valid concept in cuprates.

Abstract

Some recent experiments that provide support for the concept of topological doping in cuprate superconductors are discussed. Consistent with the idea of charge segregation, it is argued that the scattering associated with the ``resonance'' peak found in YBa(2)Cu(3)O(6+x) and Bi(2)Sr(2)CaCu(2)O(8+\delta) comes from the Cu spins and not from the doped holes.