| Téléchargement | - Voir la version finale : Evidence for decay of spin-waves above the pseudogap in underdoped YBa₂Cu₃O₆.₃₅ (PDF, 584 Kio)
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| DOI | Trouver le DOI : https://doi.org/10.1103/PhysRevB.75.172510 |
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| Auteur | Rechercher : Stock, C.; Rechercher : Cowley, R. A.; Rechercher : Buyers, W. J. L.1; Rechercher : Coldea, R.; Rechercher : Broholm, C.; Rechercher : Frost, C. D.; Rechercher : Birgeneau, R. J.; Rechercher : Liang, R.; Rechercher : Bonn, D.; Rechercher : Hardy, W. N. |
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| Affiliation | - Conseil national de recherches du Canada. Centre canadien de faisceaux de neutrons du CNRC
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| Format | Texte, Article |
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| Sujet | condensed matter - strongly correlated electrons; condensed matter - superconductivity |
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| Résumé | The magnetic spectrum at high-energies in heavily underdoped YBa₂Cu₃O₆.₃₅ (Tc = 18 K) has been determined throughout the Brillouin zone. At low-energy the scattering forms a cone of spin excitations emanating from the antiferromagnetic (0.5, 0.5) wave vector with an acoustic velocity similar to that of insulating cuprates. At high energy transfers, below the maximum energy of 270 meV at (0.5, 0), we observe zone boundary dispersion much larger and spectral weight loss more extensive than in insulating antiferromagnets. Moreover we report phenomena not found in insulators, an overall lowering of the zone-boundary energies and a large damping of ~ 100 meV of the spin excitations at high-energies. The energy above which the damping occurs coincides approximately with the gap determined from transport measurements. We propose that as the energy is raised the spin excitations encounter an extra channel of decay into particle-hole pairs of a continuum that we associate with the pseudogap. |
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| Date de publication | 2007-05-29 |
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| Maison d’édition | The American Physical Society |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 12328469 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 99373c17-23af-44a0-b46d-4c2d609cbc3c |
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| Enregistrement créé | 2009-09-10 |
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| Enregistrement modifié | 2021-10-20 |
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