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High-Resolution Photoemission on Sr2RuO4 Reveals Correlation-Enhanced Spin-Orbit Coupling and Dominantly Local Self-Energies

Published on June 7, 2019

Experiments reveal that quasiparticle properties in the superconductor Sr2RuO4 have a significant angular dependence due to the combined effects of local electron interactions and spin-orbit coupling.

We determine the variation of the mass enhancement along the entire Fermi surface, which shows a strong dependence on the direction of the quasiparticle momentum. This is often interpreted as a signature of nonlocal interactions that are strong at certain momenta and weak at others. However, using a new method to analyze our data, we show that this momentum dependence is apparent only if the problem is described in a momentum-space basis and disappears almost completely when electronic states are described in a basis of local orbitals.

This work is published in Phys. Rev. X.