Angular Dependent Magnetoresistance Oscillation of a Quasi-Two-Dimensional System in a Periodic Potential

TL;DR

This study investigates how a periodic potential influences the angular dependent magnetoresistance oscillations in a quasi-two-dimensional organic conductor, revealing temperature-dependent behaviors and predicting new resistivity peaks.

Contribution

It provides a novel explanation for low-temperature magnetoresistance anomalies without assuming Fermi surface reconstruction, differing from previous models.

Findings

High-temperature ADMRO observed in (BEDT-TTF)$_2$MHg(SCN)$_4$

Anomalously large magnetoresistance at low temperatures

Prediction of new resistivity peaks under quantizing magnetic fields

Abstract

(BEDT-TTF)$_2$MHg(SCN)$_4$[M:K,Rb,Tl] shows typical two-dimensional angular dependent magnetoresistance oscillation (ADMRO) at high temperature (T$>$8K), but at lower temperature it shows anomalously large magnetoresistance, and the ADMRO pattern changes. These low temperature behaviors are explained as effects of a periodic potential. The present explanation is different from that by Kartsovnik et al. [J. Phys. I France {\bf 3} (1993) 1187] in that reconstruction of the cylindrical Fermi surface into an open Fermi surface is not assumed. It is also predicted that if the periodic potential exists at quantizing magnetic field, resistivity peak of new origin should be observed.