Abstract
The diamagnetic response of a laser-deposited YBCO film was studied in weak exciting magnetic fields Hac=H0sinωt (H0=2–500 mOe, ω/2π=1–30 kHz). An analysis of the experimentally measured diamagnetic response showed evidence of a ring character of the electric field flowing in the sample at small H0 values. The plots of Tm (the temperature of maximum dissipative losses χ″1) versus H0 measured at various frequencies showed the existence of a certain critical field strength H*(ω) at which the (1−Tm/Tc) versus H02/3 plots exhibit a break. A logarithmic dependence of Tm on the frequency ω of the exciting field Hac is reliably valid only in the region of (ω/2π)>5 kHz. Verification of the scaling relationship showed that this relationship is valid (to within the experimental accuracy) for the frequencies ω above 5 kHz and the field amplitudes H0>H*(ω). However, the exponent n in the scaling relationship under consideration is not correlated with the exponent n in the power relationship describing the current-voltage characteristic.
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