Anomalous response of YBCO films to ultraweak magnetic fields
А. М. ГришинPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskV. F. Drobot’koPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskD. G. Emel’yanenkovPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskYu. N. InkinPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskI. V. NikonetsPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskВ. А. ХохловPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donetsk
ABI
Annotatsiya
The diamagnetic response of thin YBa2Cu3O7–x films in the vicinity of the superconducting transition temperature is studied experimentally as a function of the exciting magnetic field Hac. The films were a granular medium with a broad transition ΔT ≈ 50 K as determined from the temperature dependence R(T). It is found that in the region of ultraweak magnetic fields 0.1–5 mOe, the hysteresis losses are drastically reduced χ″ = 0.02 χ′max at Hac = 0.1 mOe) and the dissipative loss curve χ″(T) has a fine structure. With increasing Hac, the χ″ peak is displaced towards lower temperatures according to the law T = Tc [1–(Hac/H*)2/3].
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