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Evidence for ubiquitous strong electron–phonon coupling in high-temperature superconductors

Abstract

Coupling between electrons and phonons (lattice vibrations) drives the formation of the electron pairs responsible for conventional superconductivity1. The lack of direct evidence for electron–phonon coupling in the electron dynamics of the high-transition-temperature superconductors has driven an intensive search for an alternative mechanism. A coupling of an electron with a phonon would result in an abrupt change of its velocity and scattering rate near the phonon energy. Here we use angle-resolved photoemission spectroscopy to probe electron dynamics—velocity and scattering rate—for three different families of copper oxide superconductors. We see in all of these materials an abrupt change of electron velocity at 50–80 meV, which we cannot explain by any known process other than to invoke coupling with the phonons associated with the movement of the oxygen atoms. This suggests that electron–phonon coupling strongly influences the electron dynamics in the high-temperature superconductors, and must therefore be included in any microscopic theory of superconductivity.

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Figure 3: Comparison of the observed effect in photoemission, tunnelling and neutron data.
Figure 1: Ubiquity of a sudden change (‘kink’) in the dispersion.
Figure 2: Double-peak features in the photoemission spectra due to strong electron–phonon interaction.
Figure 4: Momentum dependence of the velocity ratio above and below the critical temperature.

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Acknowledgements

We thank N. Nagaosa, D. J. Scalapino, R. Laughlin, D.-H. Lee, S. Kivelson, D. Bonn, K. A. Muller, P. Allen, N. P. Armitage, A. Damascelli and F. Ronning for discussions. The work at ALS and SSRL was supported by the Department of Energy's Office of Basic Energy Science, Division of Materials Science. The Stanford work was also supported by the NSF. A.L. thanks the Instituto Nazionale Fisica della Materia (INFM) and the University of Rome “La Sapienza” for support.

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Lanzara, A., Bogdanov, P., Zhou, X. et al. Evidence for ubiquitous strong electron–phonon coupling in high-temperature superconductors. Nature 412, 510–514 (2001). https://doi.org/10.1038/35087518

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