Abstract
A sensitive sapphire dielectric resonator system has been developed to investigate the microwave surface impedance of small, HTS single crystals in zero and high applied dc magnetic fields. Independently-heated samples are mounted in a hole along the axis of a-single crystal sapphire cylinder. With a copper radiation shield, the unloaded quality factor of the cylinder resonating in its TE0.13 mode at 21 GHz is 8.105; this configuration has a measurement sensitivity around 0.2mΩ for crystals of area 1 mm2. Since the host resonator is not superconducting, we can apply dc magnetic fields up to 1.5T without degradation of the resonator performance. We present preliminary measurements of the vortex dissipation as a function of applied magnetic field and temperature at 10GHz of high quality YBCO single crystals.
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