Abstract
The surface resistance (R s) of YBa 2Cu 3O 7−x (YBCO)- crystal platelets, up to 5×10 mm 2 in size, and the microwave losses of the main flux compounds CuO and BaCuO 2±x were investigated at 3GHz. R s of all crystals drops sharply at T c by about 3 orders of magnitude. The residual surface resistance (R res) of crystals grown by the self-flux method with flux residues on the surface is dominated by the microwave losses of BaCuO 2±x. These losses are orders of magnitude higher than the losses of CuO and were found to increase below 40K. From the accordingly corrected measurement results on large crystals, we can estimate an upper limit of R resz40μΩ. With nearly flux-free but small YBCO crystals we have achieved rf field independent R res values close to the measurement limit up to 100 Oe.
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