Non-linear transport in field-induced insulating states of graphite

TL;DR

This paper investigates non-linear electrical transport phenomena in graphite under high magnetic fields, revealing complex behaviors across multiple phase transitions in the quantum limit, with implications for understanding its insulating states.

Contribution

It provides new experimental insights into the non-linear magnetotransport properties of graphite during field-induced phase transitions, an area with ongoing debate.

Findings

Non-linear magnetoresistance observed in multiple phases

Distinct non-linearity in both first and second field-induced phases

High-field measurements up to 75 T reveal complex transport behaviors

Abstract

Graphite exhibits multi-stage phase transitions in the quantum-limit states realized by magnetic fields applied along the c-axis. Despite extensive studies on this phenomenon, the origin remains a matter of debate to this day. We performed high-field magnetotransport measurements on single crystals of graphite, focusing on the non-linear conductivity in pulsed-magnetic fields of up to 75 T. The longitudinal magnetoresistance exhibits distinct non-linearity not only in the first but also in the second field-induced phases.