Fermi Surface Study of Quasi-Two-Dimensional Organic Conductors by Magnetooptical Measurements

TL;DR

This study investigates the Fermi surface properties of quasi-two-dimensional organic conductors using magnetooptical techniques, revealing different resonance behaviors and effective mass variations linked to many-body effects and sample characteristics.

Contribution

It provides new insights into the resonance phenomena and effective mass enhancements in q2D organic conductors through magnetooptical measurements.

Findings

Cyclotron resonances observed in some samples.

Periodic orbit resonances observed in others.

Effective mass shows enhancement due to many-body effects.

Abstract

Magnetooptical measurements of several quasi-two-dimensional (q2D) organic conductors, which have simple Fermi surface structure, have been performed by using a cavity perturbation technique. Despite of the simple Fermi surface structure, magnetooptical resonance results show a dramatic difference for each sample. Cyclotron resonances (CR) were observed for q-(BEDT-TTF)2I3 and (BEDT-TTF)3Br(pBIB), while periodic orbit resonances (POR) were observed for (BEDT-TTF)2Br(DIA) and (BEDT-TTF)3Cl(DFBIB). The selection of the resonance seems to correspond with the skin depth for each sample. The effective mass of POR seems to have a mass enhancement due to the many-body effect, while effective mass of CR is independent of the strength of the electron-electron interaction. The scattering time deduced from each resonance's linewidth will be also presented.