Irreversible phenomena in the absorption of electromagnetic field in HTSC plates
Alexander DyachenkoDonetsk Physicotechnical Institute, Ukrainian Academy of Sciences, Luxemburg st., 72, 340114 DonetskV. V. ChabanenkoDonetsk Physicotechnical Institute, Ukrainian Academy of Sciences, Luxemburg st., 72, 340114 Donetsk
ABI
Abstract
Temperature dependence of the impedance in the 4.2 to 300 K range and hysteresis phenomena in the absorption with the field varying from – 70 to 70 kOe were studied in the M–Ba–Cu–O (M = Y, Yb, Eu, Gd) superconductor systems. Ceramic plates were studied in the frequency range from 5·104 to 2·107 Hz. Absorption hysteresis loops revealed a minimum at a field Hmin whose value grew with increasing external field oscillation amplitude and then saturated. A transformation of the hysteresis curve was observed near the superconducting transition. Peculiarities in absorption hysteresis phenomena are explained on the basis of a theory that accounts for the effect of Abrikosov vortices in Josephson junction banks on the critical current through it.
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