Spin dynamics in the pseudogap state of a high-temperature superconductor

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dc.creatorHinkov, V.
dc.creatorBourges, P.
dc.creatorPailhes, S.
dc.creatorSidis, Y.
dc.creatorIvanov, A.
dc.creatorFrost, C. D.
dc.creatorPerring, T. G.
dc.creatorLin, C. T.
dc.creatorChen, D. P.
dc.creatorKeimer, B.
dc.date2008-06-25
dc.date.accessioned2026-07-07T09:46:40Z
dc.date.available2026-07-07T09:46:40Z
dc.descriptionThe pseudogap is one of the most pervasive phenomena of high temperature superconductors. It is attributed either to incoherent Cooper pairing setting in above the superconducting transition temperature Tc, or to a hidden order parameter competing with superconductivity. Here we use inelastic neutron scattering from underdoped YBa(2)Cu(3)O(6.6) to show that the dispersion relations of spin excitations in the superconducting and pseudogap states are qualitatively different. Specifically, the extensively studied "hour glass" shape of the magnetic dispersions in the superconducting state is no longer discernible in the pseudogap state and we observe an unusual "vertical" dispersion with pronounced in-plane anisotropy. The differences between superconducting and pseudogap states are thus more profound than generally believed, suggesting a competition between these two states. Whereas the high-energy excitations are common to both states and obey the symmetry of the copper oxide square lattice, the low-energy excitations in the pseudogap state may be indicative of collective fluctuations towards a state with broken orientational symmetry predicted in theoretical work.
dc.description6 pages, 8 figures, contains supplementary information. Some data from V. Hinkov et al., arXiv:cond-mat/0601048, is included
dc.identifierhttps://arxiv.org/abs/0806.4134
dc.identifierhttp://arxiv.org/abs/0806.4134
dc.identifierNature Physics 3, 780 (2007)
dc.identifierdoi:10.1038/nphys720
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/163607
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleSpin dynamics in the pseudogap state of a high-temperature superconductor
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