Quasi One-Dimensional Spin Fluctuations in YBa(2)Cu(3)O(6+x)

TL;DR

This paper investigates the spin fluctuations in YBa2Cu3O6+x, revealing incommensurate dynamic fluctuations along Cu-O chains influenced by itinerant holes, differing from localized antiferromagnets.

Contribution

It introduces a model incorporating antiferromagnetic interactions and Kondo-like scattering to describe spin dynamics in oxygen-deficient planes of YBa2Cu3O6+x.

Findings

Presence of incommensurate dynamic fluctuations along chains

Itinerant holes significantly alter spin dynamics

Differences from localized antiferromagnetic systems

Abstract

We study the spin fluctuation of the oxygen deficient planes of YBa(2)Cu(3)O(6+x). The Cu-O chains that constitute these planes are described by a model that includes antiferromagnetic interactions between spins and Kondo-like scattering of oxygen holes. The spectrum of magnetic excitations shows the presence of incommensurate dynamic fluctuations along the direction of the chains. The presence of itinerant holes is responsible for the existence of important differences between the spin dynamics of this system and that of a quasi-one-dimensional localized antiferromagnet. We comment on the possibility of experimental observation of these fluctuations.