Critical depinning force and vortex lattice order in disordered superconductors

Abstract

We simulate the ordering of vortices and its effects on the critical current in superconductors with varied vortex-vortex interaction strength and varied pinning strengths for a two-dimensional system. For strong pinning the vortex lattice is always disordered and the critical depinning force only weakly increases with decreasing vortex-vortex interactions. For weak pinning the vortex lattice is defect free until the vortex-vortex interactions have been reduced to a low value, when defects begin to appear with a simultaneous rapid increase in the critical depinning force. In each case the depinning force shows a maximum for non-interacting vortices. The relative height of the peak increases and the peak width decreases for decreasing pinning strength in excellent agreement with experimental trends associated with the peak effect. We show that scaling relations exist between the distance between defects in the vortex lattice and the critical depinning force.

arXiv comment5 pages, 6 figures

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Cited by in corpus (10)

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• Depinning and Dynamics of Systems with Competing Interactions in Quenched Disorder
• Commensurability Effects at Nonmatching Fields for Vortices in Diluted Periodic Pinning Arrays
• Driven Disordered Polymorphic Solids: Phases and Phase Transitions, Dynamical Coexistence and Peak Effect Anomalies
• Anisotropic Sliding Dynamics, Peak Effect, and Metastability in Stripe Systems
• Electrical transport, magnetic, and structural properties of the vortex lattice of V_3Si in the vicinity of the peak effect
• Disordering Transitions and Peak Effect in Polydisperse Particle Systems
• Dynamically Induced Locking and Unlocking Transitions in Driven Layered Systems with Quenched Disorder
• Melting, Reentrant Ordering and Peak Effect for Wigner Crystals with Quenched and Thermal Disorder