Dependence of the flux-creep activation energy on current density and magnetic field for the MgB2 superconductor
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چکیده
منابع مشابه
Effects of the sintering temperature on the flux-pinning mechanism and the activation energy of malic-acid doped MgB2
The flux-pinning mechanism and activation energy of 10 wt % malic acid-doped MgB2 were investigated by measuring of the critical current density and resistivity as a function of magnetic field and temperature. A crossover field, Bsb, was observed from the single vortex to the small vortex bundle pinning regime. For the sintered sample, the temperature dependence of Bsb(T) at low temperature i...
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Fulx-pinning mechanism and activation energy of MgB2 doped with 10 wt % malic- acid has been investigated by measurement of critical current density and resistivity as a function of magnetic fields and temperatures. The field dependence of the critical current density, Jc(B), was analyzed within the collective pinning model. A crossover field, Bsb, from the single vortex to the small vortex bun...
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متن کاملDependence of the flux creep activation energy on current density and magnetic field for MgB 2 superconductor
Systematic ac susceptibility measurements have been performed on a MgB 2 bulk sample. We demonstrate that the flux creep activation energy is a non-linear function of the current density U (j) ∝ j −0.2 , indicating a nonlogarith-mic relaxation of the current density in this material. The dependence of the activation energy on the magnetic field is determined to be a power law U (B) ∝ B −1.33 , ...
متن کاملدینامیک شار در ابررسانای Y3Ba5Cu8O18
We have studied the thermally activated flux creep of a newly fabricated superconductor Y3Ba5Cu8O18 with the superconducting transition temperature 102 K. Analysis of the transition spread from the normal state to superconducting state in the electrical resistivity revealed that the thermally activated flux creep explains the electron share in the vicinity of the transition temperature Tc. The ...
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تاریخ انتشار 2017