Study of Resistive Superconducting Transition of Bulk (Bi_{0.6}Pb_{0.4})_2Sr_2Ca_2Cu_{3}O_{x}

Abstract

The temperature widths of the resistive transition as well as the thermal uctuations of bulk (Bi0.6Pb0.4)2Sr2Ca2Cu3Ox superconductor with T c,50% = 107.1 K were studied. The applied magnetic eld widens the resistive transition according to the following formula: ∆T = CH m + ∆T0. The value of exponent m = 0.44 suggests that there is strong pining of vortices, especially at lower temperatures. The critical exponents λ of the conductivity were calculated using the following equation: ∆σ = Kε −λ , with the λ1 = 1.75 close to the zero critical temperature and λ2 = 3.77 at higher temperatures. These values were discussed within the available theoretical models.

Magnetoresistance and Irreversibility Fields of Bismuth-Based 1G Tape

“…1a, b, respectively. At the zero field, the critical temperatures for this tape are as follows: T c50 % = 110.3 K and T c0 = 109.9 K, and the width of superconducting transition is T 0 = 0.5 K. One can notice a significant broadening of the superconducting transition with the application of the external magnetic field, which is typical for HTS [12,13]. Some authors link this phenomenon with the vortex structure and flux motion mechanism [14,15].…”

Thermal Fluctuations of Bismuth Based 1G Tape

“…superconductor [18] shows that the calculated critical exponent close to the zero critical temperature was found to be λ = 1.75. This exponent is very close to that reported in this paper.…”

Magnetoresistance Study of c-Axis Oriented YBCO Thin Film

“…One can notice a significant broadening of the superconducting transition with the application of the external magnetic field, which is typical for HTS [10,11]. Some authors try to explain this phenomenon with the vortex structure and flux motion mechanism [12,13].…”