Orbital-dependent metamagnetic response in Sr4Ru3O10

TL;DR

This study reveals that the metamagnetic transition in Sr4Ru3O10 involves a two-step, orbital-dependent process with significant changes in Fermi surface geometry and quasiparticle mass, influenced by field orientation.

Contribution

It demonstrates the orbital-dependent nature of metamagnetism in Sr4Ru3O10 and links it to Fermi surface evolution and quasiparticle mass enhancement.

Findings

Metamagnetic transition bifurcates with field rotation.

Fermi surface geometry evolves non-trivially across the transition.

Quasiparticle effective mass increases at the transition.

Abstract

We show that the metamagnetic transition in Sr$_4$Ru$_3$O$_{10}$ bifurcates into two transitions as the field is rotated away from the conducting planes. This two-step process comprises partial or total alignment of moments in ferromagnetic bands followed by an itinerant metamagnetic transition whose critical field increases with rotation. Evidence for itinerant metamagnetism is provided by the Shubnikov-de Hass effect which shows a non-trivial evolution of the geometry of the Fermi surface and an enhancement of the quasiparticles effective-mass across the transition. The metamagnetic response of Sr$_4$Ru$_3$O$_{10}$ is orbital-dependent and involves ferromagnetic and metamagnetic bands.