Low-Energy Spin Dynamics of CuO Chains in YBa(2)Cu(3)O(6+x)

TL;DR

This paper investigates the spin fluctuation dynamics in Cu-O chains of YBa(2)Cu(3)O(6+x), revealing incommensurate fluctuations influenced by itinerant holes and providing theoretical predictions for neutron scattering measurements.

Contribution

It introduces a model combining antiferromagnetic interactions and Kondo-like scattering to describe spin dynamics in Cu-O chains, highlighting the role of itinerant holes.

Findings

Identification of incommensurate spin fluctuations along the chains

Dynamic structure factor differs from localized antiferromagnets due to itinerant holes

Theoretical predictions for neutron scattering experiments

Abstract

We study the spin fluctuation dynamics of Cu-O chains in the oxygen deficient planes of YBa(2)Cu(3)O(6+x). The chains are described by a model including antiferromagnetic interactions between the spins and Kondo-like scattering of the oxygen holes by the copper spins. There are incommensurate spin fluctuations along the direction of the chains. The dynamic structure factor of this system is qualitatively different from that of a quasi one-dimensional localized antiferromagnet due to the presence of itinerant holes. We compute the dynamic structure factor that could be measured in neutron scattering experiments.