Quasi-particle interference of the van Hove singularity in Sr2RuO4

A. Kreisel*, C. A. Marques, L. C. Rhodes, X. Kong, T. Berlijn, R. Fittipaldi, V. Granata, A. Vecchione, P. Wahl*, P. J. Hirschfeld

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The single-layered ruthenate Sr2RuO4 is one of the most enigmatic unconventional superconductors. While for many years it was thought to be the best candidate for a chiral p-wave superconducting ground state, desirable for topological quantum computations, recent experiments suggest a singlet state, ruling out the original p-wave scenario. The superconductivity as well as the properties of the multi-layered compounds of the ruthenate perovskites are strongly influenced by a van Hove singularity in proximity of the Fermi energy. Tiny structural distortions move the van Hove singularity across the Fermi energy with dramatic consequences for the physical properties. Here, we determine the electronic structure of the van Hove singularity in the surface layer of Sr2RuO4 by quasi-particle interference imaging. We trace its dispersion and demonstrate from a model calculation accounting for the full vacuum overlap of the wave functions that its detection is facilitated through the octahedral rotations in the surface layer.
Original languageEnglish
Article number100
Number of pages9
Journalnpj Quantum Materials
Publication statusPublished - 9 Dec 2021


Dive into the research topics of 'Quasi-particle interference of the van Hove singularity in Sr2RuO4'. Together they form a unique fingerprint.

Cite this