FIZIKA A 4 (1995) 3, 519-527

INTERPRETATION OF MICROWAVE MAGNETORESISTANCE ABOVE AND BELOW T_c IN A SINGLE CRYSTAL YBa₂Cu₃O_7-d SUPERCONDUCTOR

IGOR UKRAINCZYK^a and ANTONIJE DULČIĆ^a,b
aDepartment of Physics, Faculty of Science, University of Zagreb, POB 162, HR-10001 Zagreb, Croatia
^bRuđer Bošković Institute, POB 1016, HR-10001 Zagreb, Croatia

Dedicated to Professor Mladen Paić on the occasion of his 90^th birthday

Received 15 June 1995

Field dependence of the microwave surface resistance in YBa₂Cu₃O_7-d   single crystal is analysed in terms of the mixed state and superconducting fluctuations. Careful fitting of the appropriate parts of the magnetoresistance curves yields the upper critical field, and mean field T_c. The microwave fluctuations conductivity is found to scale as predicted for a three dimensional (3D) superconductor.

UDC 538.945
PACS 74.40.+k, 74.25.Nf, 74.60.Ec

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