An Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates

Details An Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates An Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates

2008-08-09

arxiv.org/abs/0808.1323v1

Phys. Rev. Lett. 101, 157005 (2008)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.101.157005

Angle-resolved photoemission spectroscopy with low-energy tunable photons along the nodal direction of oxygen isotope substituted Bi2Sr2CaCu2O8+delta reveals a distinct oxygen isotope shift near the electron-boson coupling "kink" in the electronic dispersion. The magnitude (a few meV) and direction of the kink shift are as expected due to the measured isotopic shift of phonon frequency, which are also in agreement with theoretical expectations. This demonstrates the participation of the phonons as dominant players, as well as pinpointing the most relevant of the phonon branches.

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