Slow oscillations of magnetoresistance in quasi-two-dimensional metals

TL;DR

This paper explains slow oscillations in magnetoresistance of quasi-two-dimensional metals as arising from Fermi surface warping, not small cyclotron orbits, and highlights their temperature resilience and potential applications.

Contribution

It demonstrates that slow oscillations originate from Fermi surface warping, providing a new understanding distinct from traditional quantum oscillations.

Findings

Slow oscillations are unaffected by temperature smearing.

They originate from Fermi surface warping, not small cyclotron orbits.

The phenomenon is likely common in clean quasi-two-dimensional metals.

Abstract

Slow oscillations of the interlayer magnetoresistance observed in the layered organic metal $\beta $-(BEDT-TTF)$_2$IBr$_2$ are shown to originate from the slight warping of its Fermi surface rather than from independent small cyclotron orbits. Unlike the usual Shubnikov-de Haas effect, these oscillations are not affected by the temperature smearing of the Fermi distribution and can therefore become dominant at high enough temperatures. We suggest that the slow oscillations are a general feature of clean quasi-two-dimensional metals and discuss possible applications of the phenomenon.