Antiferromagnetic correlations in superconducting YBa2Cu3O6+x samples as seen from optical absorption data; Comparison with the results of neutron and muon experiments

Abstract

Correlation in temperature behavior of the optical, neutron, and muon experimental data is established for YBa2Cu3O6+x in both the pseudogap state at Tc<T<T* and the superconducting state at T<Tc. We have showed that our absorption spectra measured in the vicinity of the optical gap are very sensitive to the development of antiferromagnetic fluctuations and to the formation of a stripe structure. The inelastic neutron scattering and zero-field muon spin relaxation data analyzed in this paper were taken from the measurements made by Dai et al. and Sonier et al., respectively. Comparative analysis of the independent results could be very helpful in understanding the interrelation of superconductivity and antiferromagnetism in cuprate superconductors.