Critical fields, thermally activated transport, and critical current density ofβ-FeSe single crystals

Low Sr doping effects on critical current density and pinning mechanism of YBa2Cu3O7- single crystals

We report on isotherm dc magnetization hysteresis loops, M(H) to 70K  T  82.5K of YBa2-xSrxCu3O7- (x = 0, 0.02 and 0.1) single crystals with the purpose to study the influence of the low Sr doping effects on the YBa2Cu3O7- critical current density, JC(H) and normalized flux pinning force density, f(h). The M(H) measurements were performed in a commercial SQUID magnetometer with H  50kOe ap...

Thermally activated current transport in MgB2 films

Thermally-activated flux flow (TAFF) resistivity above the irreversibility field Bi is reported for two different c-axis textured MgB2 superconducting films. Transport measurements at different perpendicular magnetic fields 0,B,9 T and temperatures from 5 to 40 K reveal TAFF Ohmic resistivity rsT ,Bd for B.Bi described by the Arrhenius law, r=r0 exps-U /Td with the quadratic field dependence of...

Enhanced critical current density in the pressure-induced magnetic state of the high-temperature superconductor FeSe

We investigate the relation of the critical current density (Jc) and the remarkably increased superconducting transition temperature (Tc) for the FeSe single crystals under pressures up to 2.43 GPa, where the Tc is increased by ~8 K/GPa. The critical current density corresponding to the free flux flow is monotonically enhanced by pressure which is due to the increase in Tc, whereas the depinnin...

High Critical Current Density Superconductivity

This project was focused on a basic scientific problem, one that is at the heart of application and development of superconductivity for efficient energy usage. This is improvement in high current density which can only be achieved by learning to pin vortices to the physical structure of its underlying superconducting material. Quantized vortices are the tornado of electrical supercurrents, ubi...

High Critical Current Density MgB