Microwave spectroscopy of Q1D and Q2D organic conductors

TL;DR

This paper reviews microwave spectroscopy studies of organic conductors, revealing their Fermi surface properties, electronic parameters, and coherent transport behavior, with potential applications in probing quasiparticles in superconductors.

Contribution

It introduces a novel microwave magneto-conductivity technique and applies it to three organic conductors, providing new insights into their electronic structure and transport properties.

Findings

All three compounds show coherent 3D band transport at low temperatures.

The low-energy properties are consistent with a semiclassical Boltzmann model.

The technique could be used to probe quasiparticles in nodal superconductors.

Abstract

This chapter reviews recent experimental studies of a novel open-orbit magnetic resonance phenomenon. The technique involves measurement of angle-dependent microwave magneto-conductivity and is, thus, closely related to the cyclotron resonance and angle-dependent magnetoresistance techniques. Data for three contrasting materials are presented: (TMTSF)2ClO4, alpha-(BEDT-TTF)2KHg(SCN)4 and kappa-(BEDT-TTF)2I3. These studies reveal important insights into the Fermiology of these novel materials, as well as providing access to important electronic parameters such as the in-plane Fermi velocity and quasiparticle scattering rate. It is argued that all three compounds exhibit coherent three-dimensional band transport at liquid helium temperatures, and that their low-energy magnetoelectrodynamic properties appear to be well explained on the basis of a conventional semiclassical Boltzmann approach. It is also suggested that this technique could be used to probe quasiparticles in nodal superconductors.