Strength of the Spin-Fluctuation-Mediated Pairing Interaction in a High-Temperature Superconductor

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dc.creatorDahm, T.
dc.creatorHinkov, V.
dc.creatorBorisenko, S. V.
dc.creatorKordyuk, A. A.
dc.creatorZabolotnyy, V. B.
dc.creatorFink, J.
dc.creatorBüchner, B.
dc.creatorScalapino, D. J.
dc.creatorHanke, W.
dc.creatorKeimer, B.
dc.date2008-12-19
dc.date.accessioned2026-07-07T12:51:28Z
dc.date.available2026-07-07T12:51:28Z
dc.descriptionTheories based on the coupling between spin fluctuations and fermionic quasiparticles are among the leading contenders to explain the origin of high-temperature superconductivity, but estimates of the strength of this interaction differ widely. Here we analyze the charge- and spin-excitation spectra determined by angle-resolved photoemission and inelastic neutron scattering, respectively, on the same crystals of the high-temperature superconductor YBa2Cu3O6.6. We show that a self-consistent description of both spectra can be obtained by adjusting a single parameter, the spin-fermion coupling constant. In particular, we find a quantitative link between two spectral features that have been established as universal for the cuprates, namely high-energy spin excitations and "kinks" in the fermionic band dispersions along the nodal direction. The superconducting transition temperature computed with this coupling constant exceeds 150 K, demonstrating that spin fluctuations have sufficient strength to mediate high-temperature superconductivity.
dc.description25 pages, 7 figures, including supplementary information, accepted for publication in Nature Physics
dc.identifierhttps://arxiv.org/abs/0812.3860
dc.identifierhttp://arxiv.org/abs/0812.3860
dc.identifierNature Physics 5, 217 (2009)
dc.identifierdoi:10.1038/nphys1180
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/222997
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleStrength of the Spin-Fluctuation-Mediated Pairing Interaction in a High-Temperature Superconductor
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