Experimental phase diagram of moving vortices

Abstract

In the mixed state of type II superconductors, vortices penetrate the sample and form a correlated system due to the screening of supercurrents around them. Interestingly, we can study this correlated system as a function of density and driving force. The density, for instance, is controlled by the magnetic field, B, whereas a current density j acts as a driving force F=jxB on all vortices. The free motion of vortices is inhibited by the presence of an underlying potential, which tends to pin the vortices. Hence, to minimize the pinning strength we studied a superconducting glass in which the depinning current is 10 to 1000 times smaller than in previous studies, which enables us to map out the complete phase diagram in this new regime. The diagram is obtained as a function of B, driving current and temperature and led a remarkable set of new results, which includes a huge peak effect, an additional reentrant depinning phase and a driving force induced pinning phase.

4 pages

References in corpus (10)

• Elastic theory of flux lattices in presence of weak disorder
• Creep and depinning in disordered media
• Nonequilibrium Dynamic Phase Diagram for Vortex Lattices
• Moving glass theory of driven lattices with disorder
• A Bragg glass phase in the vortex lattice of a type II superconductor
• Vortex dynamics in two-dimensional systems at high driving forces
• Peak effect in twinned superconductors
• STM Imaging of Flux Line Arrangements in the Peak Effect Regime
• Defects, order, and hysteresis in driven charge-density waves
• Anomalous Sliding Friction and Peak Effect near the Flux Lattice Melting Transition

Cited by in corpus (8)

• Nonlinear sliding friction of adsorbed overlayers on disordered substrates
• Superconductivity and short range order in metallic glasses Fe${}_x$Ni${}_{1-x}$Zr${}_2$
• Transverse Vortex Dynamics in Superconductors
• The strengthening of reentrant pinning by collective interactions in the peak effect
• Irreversible Dynamics of Abrikosov Vortices in Type-two Superconductors
• Melting, Reentrant Ordering and Peak Effect for Wigner Crystals with Quenched and Thermal Disorder
• Local magnetization fluctuations in superconducting glasses resolved by Hall sensors
• Orientational coupling between the vortex lattice and the crystalline lattice in a weakly pinned Co0.0075NbSe2 single crystal