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RISCoexistence of the δl and δTc flux pinning mechanism in nano-Si doped MgB2
The flux pinning mechanisms of nano-Si-doped MgB2 are reported in this work. The field
dependence of the critical current density, Jc(B), was analyzed within the collective pinning
model. We found that the mechanisms for both δl...
Magnetic vortex flux pinning in silicone-oil doped MgB2
The field dependence of the critical current density, jc (B), of MgB2 doped with 10 weight % liquid precursor, silicone oil, was measured. The enhanced jc (B) compared to the pure MgB2 was obtained. An observed temperature dependence...
Critical Current Density and Intergranular Coupling Study of the Dysprosium Oxide Nanoparticle Added Bi1.6Pb0.4Sr2Ca2Cu3Oy Superconductor
The dysprosium oxide nanoparticles’ addition effects on structural, DC electrical resistivity, critical current density, and AC magnetic susceptibility properties of polycrystalline Bi1.6Pb0.4Sr2Ca2Cu samples are investigated. X-ray diffraction (XRD...
Hydrostatic pressure induced transformation from δT_c to δl pinning in MgB2
The impact of hydrostatic pressure up to 1.2 GPa on the critical current density (Jc) and the nature of the pinning mechanism in MgB2 have been investigated within the framework of the collective theory. We found that the hydrostatic pressure can...
Flux pinning mechanism in codoped-MgB2 with Al2O3 and SiC
MgB2 superconductor samples, co-doped with 0.02 wt of Al2O3 and 0.02 wt SiC, have been examined by M-H loop measurements and calculation of the critical current density based on the Bean model. Normalized volume pinning force, f= F/Fmax, as a...
Stability analysis of nonlinear self-excited vibration in cold rolling main drive system
Flux pinning mechanism in SiC and nano-C doped MgB2: Evidence for transformation from δTc to δl pinning
Magnetic and transport properties of 10 wt% SiC doped MgB2 and 5 wt% nano-C doped MgB2 were studied by resistance and critical current density measurements. The results showed improvement of the critical current density for the MgB2 superconductor...
On the Determination of Pinning Mechanisms and Regimes in Type-II Superconductors with Weak Thermal Fluctuations
type-II superconductors and with the capacity to be used at various magnetic fields (in which the vortices may be pinned in the single vortex, small bundle, or large bundle regime), we adopt more general assumptions, by employing the critical current...
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 ofmagnetic field and temperature. A crossover field, Bsb, was observed...
Enhancement of the in-field Jc of MgB2 via SiCl4 doping
We present the following results: 1) We introduce a doping source for MgB2, liquid SiCl4, which is free of C, to significantly enhance the irreversibility field (Hirr) , the upper critical field (Hc2), and the critical current density (Jc ) with a...