Strength of the spin-fluctuation-mediated pairing interaction in a high-temperature superconductor

Dahm T, Hinkov V, Borisenko SV, Kordyuk AA, Zabolotnyy VB, Fink J, Buechner B, Scalapino DJ, Hanke W, Keimer B (2009)
Nature Physics 5(3): 217-221.

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Abstract
Theories 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(1). Here, we analyse 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 YBa(2)Cu(3)O(6.6). 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(2-7) and 'kinks' in the fermionic band dispersions along the nodal direction(8-12). The superconducting transition temperature computed with this coupling constant exceeds 150 K, demonstrating that spin fluctuations have sufficient strength to mediate high-temperature superconductivity.
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Dahm T, Hinkov V, Borisenko SV, et al. Strength of the spin-fluctuation-mediated pairing interaction in a high-temperature superconductor. Nature Physics. 2009;5(3):217-221.
Dahm, T., Hinkov, V., Borisenko, S. V., Kordyuk, A. A., Zabolotnyy, V. B., Fink, J., Buechner, B., et al. (2009). Strength of the spin-fluctuation-mediated pairing interaction in a high-temperature superconductor. Nature Physics, 5(3), 217-221.
Dahm, T., Hinkov, V., Borisenko, S. V., Kordyuk, A. A., Zabolotnyy, V. B., Fink, J., Buechner, B., Scalapino, D. J., Hanke, W., and Keimer, B. (2009). Strength of the spin-fluctuation-mediated pairing interaction in a high-temperature superconductor. Nature Physics 5, 217-221.
Dahm, T., et al., 2009. Strength of the spin-fluctuation-mediated pairing interaction in a high-temperature superconductor. Nature Physics, 5(3), p 217-221.
T. Dahm, et al., “Strength of the spin-fluctuation-mediated pairing interaction in a high-temperature superconductor”, Nature Physics, vol. 5, 2009, pp. 217-221.
Dahm, T., Hinkov, V., Borisenko, S.V., Kordyuk, A.A., Zabolotnyy, V.B., Fink, J., Buechner, B., Scalapino, D.J., Hanke, W., Keimer, B.: Strength of the spin-fluctuation-mediated pairing interaction in a high-temperature superconductor. Nature Physics. 5, 217-221 (2009).
Dahm, Thomas, Hinkov, V., Borisenko, S. V., Kordyuk, A. A., Zabolotnyy, V. B., Fink, J., Buechner, B., Scalapino, D. J., Hanke, W., and Keimer, B. “Strength of the spin-fluctuation-mediated pairing interaction in a high-temperature superconductor”. Nature Physics 5.3 (2009): 217-221.
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