Eur. Phys. J. Appl. Phys.
Volume 80, Number 3, December 2017
|Number of page(s)||4|
|Section||Spintronics, Magnetism, Superconductivity|
|Published online||01 December 2017|
Effect of dc field on ac-loss peak in a commercial Bi:2223/Ag tape
Karadeniz Technical University, Faculty of Science and Arts, Department of Physics,
2 Gümüşhane University, Faculty of Engineering and Natural Sciences, Department of Physics Engineering, 29100 Gümüşhane, Turkey
* e-mail: email@example.com
Received in final form: 16 October 2017
Accepted: 7 November 2017
Published online: 1 December 2017
Measurements of the ac susceptibility in a commercial Bi:2223/Ag tape for some different ac magnetic field amplitudes, Hac, in the presence of bias magnetic field Hdc directed along Hac are reported. It is found that the peak values of the imaginary component of ac susceptibility χ″max versus Hac trace a valley for the orientation where applied field Ha perpendicular to wide face of the tape total. We note that the observation of the valley depends on various parameters such as field dependence parameter n in the critical current density, in the simple power law expression jc = α(T)/Bn, choice of the bias field Hdc together with selected ac field amplitudes Hac, and dimension and geometry of sample studied. Our calculations based on critical state model with jc = α(1 − T/Tcm)p/Bn using the fitting parameters of n = 0.25, p = 2.2, Tcm = 108 K gives quite good results to compare the experimental and calculated curves.
© EDP Sciences, 2017
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