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Precise measurements of magnetic moment relaxation of YBa2Cu3O7-δ films were carried out in temperature range 4.2K < T < 80K at low magnetic field H ≈ 910Oe. Temperature dependence of the glassy exponent μ of dependence of the activation energy U for vortices motion on current J was analyzed. It was obtained that μ increases from negative values at low temperatures T ≤ 10K to μ ≈ 1–2 at T ≈...
Precise measurements of a magnetic moment relaxation of YBa2Cu3O7-δ film were carried out at temperature T = 32K at the magnetic fields H ≤ 1600Oe. The moment M, relaxation rates R = – dM / dln t and S = R / M as well as glassy exponent μ were analyzed in partly and fully penetrated critical state in dependence on increasing and decreasing field. We demonstrated that a demagnetization affects the...
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