Transport Barkhausen-like noise TBN measured in sample BP4 for a normalized excitation current density , where is the critical current density at zero applied magnetic field. The ac triangular applied magnetic field, , used in all measurements is also shown in the Figure. represents the time width in which the TBN signal occurs.
2-D phase space for the m-dimensional reconstructed orbit with time delayed coordinates of the filtered TBN series for τ = 4 of (a) sample BP2 and (b) sample BP4. The ratio has been used for both samples. The inset displays the noisy component near the center of the orbit (see comments in the text).
Some parameters of the samples studied in this work: the compacting pressure, P, the Lontgering factor along (00 l) direction, , the onset superconducting critical temperature, Ton , the offset superconducting critical temperature, Toff , the effective intergranular pinning energy, U 0, and the transport critical current density at zero applied magnetic field, Jc (0), and 77 K. The parameters were extracted from Ref. 3 .
Nonlinear parameters of the TBN signals measured in the studied samples for different values of : embedding dimension m, maximal Lyapunov exponent , and the Kaplan-Yorke dimension DKY .
Results of the determinist test, , for the filtered and unfiltered TBN signals measured in the studied samples for different values of the ratio .
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