Universal Behavior of Magnetoresistance in Organic Dirac Electron Systems

Abstract

In-plane magnetoresistance for organic massless Dirac electron system (OMDES) $\alpha$-(BEDT-TTF)${}_2$I${}_3$ and $\theta$-(BEDT-TTF)${}_2$I${}_3$ in addition to possible candidates of the OMDES $\alpha$-(BETS)${}_2$I${}_3$ and $\alpha$-(BEDT-STF)${}_2$I${}_3$, was investigated under hydrostatic pressure. We have found the universal behavior of the in-plane magnetoresistance under a low magnetic field perpendicular to two-dimensional plane. As for $\alpha$-(BEDT-TTF)${}_2$I${}_3$, the universality was examined with the parameters of temperature, magnetic field and its direction. We suggest that the universal magnetoresistance behavior is found even for the gapped state of $\alpha$-(BEDT-TTF)${}_2$I${}_3$ under intermediate pressure, when the thermal energy exceeds the gap.

11 pages, 4 figures

References in corpus (5)

• Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor
• Effects of the Zero-Mode Landau Level on Inter-Layer Magnetoresistance in Multilayer Massless Dirac Fermion Systems
• Longitudinal conductivity of massless fermions with tilted Dirac cone in magnetic field
• Exotic Dirac Cones on the Band Structure of $\alpha$-STF${}_2$I${}_3$ at Ambient Temperature and Pressure
• Theory of inplane magnetoresistance in two-dimensional massless Dirac fermion system

Cited by in corpus (4)

• Pressure-induced phase switching of the Shubnikov de Haas oscillations in molecular Dirac fermion system $\alpha -$(BETS)${}_2$I${}_3$
• Observations of $\nu =1$ Quantum Hall Effect and Inter-Band Effects of Magnetic fields on Hall Conductivity in Organic Massless Dirac Fermion System $\alpha$-(BETS)${}_2$I${}_3$ under Pressure
• Anomalous Phase-Coherence Scaling in a Quantum-Critical Dirac Semimetal
• Ambient-Pressure Organic Dirac Electron State in $\alpha$-(BETS)${}_2$AuCl${}_2$