Vortex dynamics and critical current in superconductors with unidirectional twin boundaries

Hidehiro Asai; Satoshi Watanabe

doi:10.1103/PhysRevB.77.224514

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Vortex dynamics and critical current in superconductors with unidirectional twin boundaries

Hidehiro Asai, Satoshi Watanabe

DOI 10.1103/PhysRevB.77.224514 · Physical Review B

T1

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Abstract

We have studied the dynamics of vortices interacting with unidirectional twin boundaries (TBs) in a superconductor using molecular-dynamics simulation based on the overdamped equation of vortex motion. Current-voltage curves and critical currents have been calculated as a function of vortex density. We found that the critical current as a function of vortex density reveals a staircase pattern and this pattern depends on the pinning strength. This behavior corresponds to discontinuous change of vortex configurations, which reflects vortex pinning characteristics of superconductors with TBs. We also discuss the effect of matching between vortex lattice and TBs and reveal that its behavior is different from the one in the case of columnar pinning.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown