The Spin Excitation Spectrum in Superconducting ${\bf YBa_2Cu_3O_{6.85}}$

Details The Spin Excitation Spectrum in Superconducting ${\bf YBa_2Cu_3O_{6.85}}$ The Spin Excitation Spectrum in Superconducting ${\bf YBa_2Cu_3O_{6.85}}$

2000-06-06

arxiv.org/abs/cond-mat/0006086v1

Science, {\bf 288} p 1234 (2000)

Physics

Condensed Matter

Superconductivity

4 figures in Postscript

Scientific paper

10.1126/science.288.5469.1234

A comprehensive inelastic neutron scattering study of magnetic excitations in the near-optimally doped high-temperature superconductor ${\rm YBa_{2}Cu_{3}O_{6.85}}$ is presented. The spin correlations in the normal state are commensurate with the crystal lattice, and the intensity is peaked around the wave vector characterizing the antiferromagnetic state of the insulating precursor ${\rm YBa_{2}Cu_{3}O_{6}}$. Profound modifications of the spin excitation spectrum appear abruptly below the superconducting transition temperature, $\rm T_C$, where a commensurate resonant mode and a set of weaker incommensurate peaks develop. The data are consistent with models based on an underlying two-dimensional Fermi surface that predict a continuous, downward dispersion relation connecting the resonant mode and the incommensurate excitations. The magnetic incommensurability in the ${\rm YBa_{2}Cu_{3}O_{6+x}}$ system is thus not simply related to that of another high temperature superconductor, ${\rm La_{2-x}Sr_xCuO_{4}}$, where incommensurate peaks persist well above $\rm T_C$. The temperature dependent incommensurability is difficult to reconcile with interpretations based on charge stripe formation in ${\rm YBa_{2}Cu_{3}O_{6+x}}$ near optimum doping.

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