| Téléchargement | - Voir le manuscrit accepté : Effect of the pseudogap on suppressing high energy inelastic neutron scattering in superconducting YBa2Cu3O6.5 (PDF, 779 Kio)
|
|---|
| DOI | Trouver le DOI : https://doi.org/10.1103/PhysRevB.82.174505 |
|---|
| Auteur | Rechercher : Stock, C.; Rechercher : Cowley, R. A.; Rechercher : Buyers, W. J. L.1; Rechercher : Frost, C. D.; Rechercher : Taylor, J. W.; Rechercher : Peets, D.; Rechercher : Liang, R.; Rechercher : Bonn, D.; Rechercher : Hardy, W. N. |
|---|
| Affiliation | - Conseil national de recherches du Canada. Centre canadien de faisceaux de neutrons du CNRC
|
|---|
| Format | Texte, Article |
|---|
| Résumé | We 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. |
|---|
| Date de publication | 2010-11-01 |
|---|
| Dans | |
|---|
| Langue | anglais |
|---|
| Publications évaluées par des pairs | Oui |
|---|
| Numéro NPARC | 16885317 |
|---|
| Exporter la notice | Exporter en format RIS |
|---|
| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
|---|
| Identificateur de l’enregistrement | 2920d507-f394-462b-814f-2c980c967426 |
|---|
| Enregistrement créé | 2011-02-16 |
|---|
| Enregistrement modifié | 2020-04-17 |
|---|
