Absence of Metal-Insulator-Transition and Coherent Interlayer Transport in oriented graphite in parallel magnetic fields

TL;DR

This study investigates how magnetic field orientation affects the electronic transport in graphite, revealing the absence of a metal-insulator transition in parallel fields and highlighting the coherence of interlayer transport depending on disorder.

Contribution

It demonstrates that the metal-insulator transition is absent in parallel magnetic fields and clarifies the conditions under which interlayer transport remains coherent in graphite.

Findings

No metal-insulator transition in parallel magnetic fields.

Interlayer transport coherence depends on sample disorder and magnetic field strength.

Graphite exhibits two-dimensional electron behavior in ideal samples.

Abstract

Measurements of the magnetoresistivity of graphite with a high degree of control of the angle between the sample and magnetic field indicate that the metal-insulator transition (MIT), shown to be induced by a magnetic field applied perpendicular to the layers, does not appear in parallel field orientation. Furthermore, we show that interlayer transport is coherent in less ordered samples and high magnetic fields, whereas appears to be incoherent in less disordered samples. Our results demonstrate the two-dimensionality of the electron system in ideal graphite samples.