Fermi surface and van Hove singularities in the itinerant metamagnet Sr3Ru2O7

TL;DR

This study explores the electronic structure of Sr3Ru2O7, revealing complex Fermi surface features, van Hove singularities near the Fermi level, and their implications for magnetic instabilities, using advanced experimental and computational methods.

Contribution

It provides a detailed characterization of the Fermi surface and van Hove singularities in Sr3Ru2O7, combining ARPES and DFT to enhance understanding of its magnetic properties.

Findings

Well-defined quasiparticle bands with low Fermi velocities

Fermi surface topology matches de Haas-van Alphen data

Presence of van Hove singularities near the Fermi level

Abstract

The low-energy electronic structure of the itinerant metamagnet Sr3Ru2O7 is investigated by angle resolved photoemission and density functional calculations. We find well-defined quasiparticle bands with resolution limited line widths and Fermi velocities up to an order of magnitude lower than in single layer Sr2RuO4. The complete topography, the cyclotron masses and the orbital character of the Fermi surface are determined, in agreement with bulk sensitive de Haas - van Alphen measurements. An analysis of the dxy band dispersion reveals a complex density of states including van Hove singularities (vHs) near the Fermi level; a situation which is favorable for magnetic instabilities.