Microwave conductivity measurements by the coaxial resonator technique. I. Description of the method and applications to TTF-TCNQ and related compounds

The coaxial-resonator technique, which has been used in the past to measure the surface impedance of metal wires, is also well suited to measuring the microwave conductivities of crystals of highly conducting organic salts such as tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ). In this technique the small needlelike crystal forms the center conductor of an open coaxial cavity which resonates whenever the crystal length is an integral …