Isotopic Fingerprint of Electron-Phonon Coupling in High-Tc Cuprates
Abstract
Angle-resolvedphotoemission spectroscopy with low-energy tunable photons along the nodal direction of oxygen isotope substituted Bi2Sr2CaCu2O8+δ reveals a distinct oxygen isotope shift near the electronboson coupling "kink" in the electronic dispersion. The magnitude (afew meV) and direction of the kink shift are as expected due to the measured isotopic shift of phonon frequency, and 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.
- Publication:
-
Electron-Phonon Interaction and Lattice Dynamics in High Tc Superconductors
- Pub Date:
- March 2020
- DOI:
- 10.1142/9789813271142_0008
- Bibcode:
- 2020epil.book..203I