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Distribution of activation energies on undoped and SiC-doped superconducting wires
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View: Figures


Image of FIG. 1.
FIG. 1.

and of SiC-doped (▴) and undoped (+) samples estimated from the FC and ZFC measurements at different magnetic fields. Lines are eyeguides. The inset shows dependencies estimated for both samples from magnetization hysteresis loops at different temperatures.

Image of FIG. 2.
FIG. 2.

Temperature dependence of the relative relaxation rate, , for the doped (▴) and undoped (+) samples at different magnetic fields. The inset shows normalized magnetic relaxation measurements at and at different temperatures for both analyzed samples.

Image of FIG. 3.
FIG. 3.

Normalized distribution function (solid lines), , for the undoped and SiC-doped samples at , obtained by the HG method. The inset shows the scaled distributions, , estimated at different fields (1.5, 3, and ) for the doped sample (the arrow indicates increasing fields). The discontinuous lines correspond to log-normal distributions, , with and for the undoped and doped sample, respectively, in the main figure, and , 0.07, and in the inset. in all cases.

Image of FIG. 4.
FIG. 4.

Effective activation energies, vs determined by Maley’s method at and different temperatures for the doped (continuous lines) and undoped sample (discontinuous lines). , and in all cases. The inset shows the same data, together with the results at , with the axis in a log scale. The arrow indicates increasing fields. Data are constructed from measurements at temperatures from and for the doped sample, and to and for the undoped sample. Lines are fits to with .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Distribution of activation energies on undoped and SiC-doped superconducting MgB2 wires