Effect of splayed pins on vortex creep and critical currents

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTORS;    COLUMNAR DEFECTS;    YBA2CU3O7 CRYSTALS;    BOSON LOCALIZATION;    LINEAR DEFECTS;    ANGLES;    BI2SR2CACU2O8;    CONFIGURATIONS;    ENTANGLEMENT;    IRRADIATION;   

DOI  :  10.1103/PhysRevB.62.R3612

来源: SCIE

【 摘 要 】

We study the effects of splayed columnar pins on the vortex motion using realistic London-Langevin simulations. At low currents vortex creep is strongly suppressed, whereas the critical current j(c) is enhanced only moderately. Splaying the pins generates an increasing energy barrier against vortex hopping, and leads to the forced entanglement of vortices, both of which suppress creep efficiently. On the other hand splaying enhances kink nucleation and introduces intersecting pins, which cut off the energy barriers. Thus the j(c) enhancement is strongly parameter sensitive. We also characterize the angle dependence of j(c) and the effect of different splaying geometries.

【 授权许可】

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