| Download | - View final version: Evidence for decay of spin-waves above the pseudogap in underdoped YBa₂Cu₃O₆.₃₅ (PDF, 584 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1103/PhysRevB.75.172510 |
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| Author | Search for: Stock, C.; Search for: Cowley, R. A.; Search for: Buyers, W. J. L.1; Search for: Coldea, R.; Search for: Broholm, C.; Search for: Frost, C. D.; Search for: Birgeneau, R. J.; Search for: Liang, R.; Search for: Bonn, D.; Search for: Hardy, W. N. |
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| Affiliation | - National Research Council of Canada. NRC Canadian Neutron Beam Centre
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| Format | Text, Article |
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| Subject | condensed matter - strongly correlated electrons; condensed matter - superconductivity |
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| Abstract | 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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| Publication date | 2007-05-29 |
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| Publisher | The American Physical Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 12328469 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | 99373c17-23af-44a0-b46d-4c2d609cbc3c |
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| Record created | 2009-09-10 |
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| Record modified | 2021-10-20 |
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