Commensurate and Incommensurate Spin Fluctuations in YBa_2Cu_3O_{6+y}

TL;DR

This paper interprets neutron scattering data on spin fluctuations in YBa2Cu3O(6+y), explaining the transition between commensurate and incommensurate spectra through electronic dispersion and superconducting phase effects.

Contribution

It offers a novel interpretation linking spin fluctuation behavior to electronic dispersion and d-wave superconductivity in YBa2Cu3O(6+y).

Findings

Explains the switch between commensurate and incommensurate fluctuations.

Accounts for temperature and frequency dependence of spin spectra.

Provides a unified scenario for observed neutron data.

Abstract

We present an interpretation of the recent neutron data on the commensurate and incommensurate spin fluctuations found in YBa_2d$Cu_3O_{6+y} based on a special configuration of the electronic dispersion and intervention from the d_{x^2-y^2}-wave superconducting phase. The observed switch over between the commensurate and incommensurate fluctuation spectra at the change of frequency or temperature is naturally accounted within this scenario.