Abstract
Studies of the microwave properties of sintered material and of single crystals of YBA 2Cu 3O 7 were carried out in the frequency range of 4.6 to 23 GHz using the cavity perturbation technique. Placing the samples in the antinode of the electric field or of the magnetic field allows to determine the microwave conductivity directly or from the eddy current losses, respectively. In the temperature range T > T C the microwave conductivity was found distinctly smaller than the dc conductivity apparently due to the existence of conductive paths in a filamentlike structure. However the values of the ac conductivity measured at frequencies up to 10 MHz agree with the dc values. - The thermal expansion can be determined from the temperature dependence of the frequency shift. - The microwave conductivities in the superconducting range enable the determination of the energy gap.
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