FIZIKA A 8 (1999) 4 , 245-252

MICROWAVE CONDUCTIVITY OF THIN YBCO FILM IN MAGNETIC FIELD

N. BARIŠIĆ, A. DULIĆ, M. POŽEK and D. PAAR

Department of Physics, Faculty of Science, Bijenika 32, HR-10000 Zagreb, Croatia

Dedicated to Professor Boran Leontić on the occasion of his 70^th birthday

Received 12 November 1999; Accepted 10 April 2000

The microwave response of a thin film of high temperature superconductor YBa₂Cu₃O_{7 - d} was measured for a wide region of temperatures and magnetic fields. From the measured complex frequency shift, the complex conductivity was calculated. The model for effective conductivity in the mixed state was fitted to the complex conductivity data and the values of upper critical fields B_c2(T) and depinning frequencies w₀ (T) have been obtained as fitted parameters.

ACS numbers: 74.25.Nf, 74.60.Ec, 74.60.Ge, 74.76.Bz
UDC 538.915

Keywords: YBa₂Cu₃O_{7 - d}, high temperature superconductor, thin film, complex frequency shift, complex conductivity, upper critical fields, depinning frequencies

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