Effect of the pseudogap on suppressing high energy inelastic neutron scattering in superconducting YBa2Cu3O6.5

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.82.174505
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TypeArticle
Journal titlePhysical review. B, Condensed matter and materials physics
Volume82
Issue17
Pages174505-1174505-15; # of pages: 15
AbstractWe have measured the spin fluctuations in the YBa₂Cu₃O₆.₅ (YBCO₆.₅ ,Tc=59 K) superconductor at high-energy transfers above ~100 meV. Within experimental error, the momentum dependence is isotropic at high energies, similar to that measured in the insulator for two-dimensional spin waves, and the dispersion extrapolates back to the incommensurate wave vector at the elastic position. This result contrasts with previous expectations based on measurements around 50 meV which were suggestive of a softening of the spin-wave velocity with increased hole doping. Unlike the insulator, we observe a significant reduction in the intensity of the spin excitations for energy transfers above ~100 meV similar to that observed above ~200 meV in the YBCO₆.₃₅ (Tc=18 K) superconductor as the spin waves approach the zone boundary. We attribute this high-energy scale with a second gap and find agreement with measurements of the pseudogap in the cuprates associated with electronic anomalies along the antinodal positions. In addition, we observe a sharp peak at around 400 meV whose energy softens with increased hole doping. We discuss possible origins of this excitation including a hydrogen-related molecular excitation and a transition of electronic states between d levels.
Publication date
LanguageEnglish
AffiliationNRC Canadian Neutron Beam Centre; National Research Council Canada
Peer reviewedYes
NPARC number16885317
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Record identifier2920d507-f394-462b-814f-2c980c967426
Record created2011-02-16
Record modified2016-05-09
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