Magnetic irreversibility and pinning force density in the MoRe alloy superconductors
arXiv:1801.05093 · doi:10.1016/j.physc.2015.08.001
Abstract
We have measured the isothermal field dependence of magnetization of the MoRe (15 x 48) alloys, and have estimated the critical current and pinning force density from these measurements. We have performed structural characterization of the above alloys using standard techniques, and analyzed the field dependence of critical current and pinning force density using existing theories. Our results indicate that dislocation networks and point defects like voids and interstitial imperfections are the main flux line pinning centres in the MoRe alloys in the intermediate fields, i.e., in the small bundle flux line pinning regime. In this regime, the critical current density is also quite robust against increasing magnetic field. In still higher fields, the critical current density is affected by flux creep. In the low field regime, on the other hand, the pinning of the flux lines seems to be influenced by the presence of two superconducting energy gaps in the MoRe alloys. This modifies the field dependence of critical current density, and also seems to contribute to the asymmetry in the magnetic irreversibility exhibited by the isothermal field dependence of magnetization
29 pages, 10 figures
References in corpus (2)
Cited by in corpus (6)
- Plastic pinning replaces collective pinning as the second magnetization peak disappears in the pnictide superconductor Ba-KFeAs
- Enhancement of functional properties of VTi alloy superconductor by the addition of yttrium
- Vortex Dynamics and Phase Diagram in the Electron Doped Cuprate Superconductor PrLaCeCuO
- Vortex-glass transformation within the surface superconducting state of -phase MoRe alloys
- Second magnetization peak, anomalous field penetration, and Josephson vortices in KCaFeAsF bilayer pnictide superconductor
- Large self-heating by trapped-flux reduction in Sn-Pb solders