Magnetoquantum oscillations in the resistance of metallic point contacts: Influence of nonequilibrium phonons

TL;DR

This study investigates how nonequilibrium phonons influence magnetoresistance quantum oscillations in metallic point contacts, revealing nonmonotonous amplitude changes with applied bias voltage.

Contribution

It provides new insights into the role of nonequilibrium phonons and phonon-phonon collisions in quantum oscillation behavior in metallic point contacts.

Findings

Oscillation amplitude varies nonmonotonously with bias voltage.

Different contact groups show opposite trends in amplitude change.

Electron-phonon interactions significantly affect quantum oscillations.

Abstract

The amplitude of magnetoresistance quantum oscillations of Al and Be point contacts in a magnetic field parallel to the contact axis has been studied as a function of voltage applied over the contact. It was found that for one group of contacts the oscillation amplitude nonmonotonously increases with the bias voltage increase, while for the other part of the contacts a decrease of amplitude was observed. The scattering of electrons with nonequilibrium phonons and also phonon-phonon collisions will be discussed as the possible reasons of the observed effects.