Quantum oscillations in the anomalous phase in Sr3Ru2O7

TL;DR

This study detects quantum oscillations in the nematic phase of Sr3Ru2O7, revealing details about its Fermi surface and electronic properties through improved sample purity and dHvA measurements.

Contribution

It provides the first detailed observation of quantum oscillations within the nematic phase of Sr3Ru2O7, linking Fermi surface features to phase behavior.

Findings

Two distinct quantum oscillation frequencies observed.

Fermi surface sheets match those outside the phase.

Amplitude variations linked to density of states and domains.

Abstract

We report measurements of quantum oscillations detected in the putative nematic phase of Sr3Ru2O7. Significant improvements in sample purity enabled the resolution of small amplitude dHvA oscillations between two first order metamagnetic transitions delimiting the phase. Two distinct frequencies were observed, and their amplitudes follow the normal Lifshitz-Kosevich profile. The Fermi surface sheets seem to correspond to a subset of those detected outside the phase. Variations of the dHvA frequencies are explained in terms of a chemical potential shift produced by reaching a peak in the density of states, and an anomalous field dependence of the oscillatory amplitude provides information on domains.