Disordering Transitions in Vortex Matter: Peak Effect and Phase Diagram

Abstract

Using numerical simulations of magnetically interacting vortices in disordered layered superconductors we obtain the static vortex phase diagram as a function of magnetic field and temperature. For increasing field or temperature, we find a transition from ordered straight vortices to disordered decoupled vortices. This transition is associated with a peak effect in the critical current. For samples with increasing disorder strength the field at which the decoupling occurs decreases. Long range, nonlinear interactions in the c-axis are required to observe the effect.

4 pages, 4 postscript figures

References in corpus (8)

• Instabilities and disorder-driven first-order transition of the vortex lattice
• Abrupt Change of Josephson Plasma Frequency at the Phase Boundary of the Bragg Glass in Bi_2Sr_2CaCu_2O_{8+δ}
• Supercooling of the disordered vortex lattice in Bi_2Sr_2CaCu_2O_8+d
• Effects of point defects on the phase diagram of vortex states in high-Tc superconductors in B//c axis
• Static and dynamic coupling transitions of vortex lattices in disordered anisotropic superconductors
• Disorder Driven Melting of the Vortex Line Lattice
• Giant Peak Effect Observed in Ultrapure YBCO Crystal
• Melting and Dimensionality of the Vortex Lattice in Underdoped YBa2Cu3O6.60

Cited by in corpus (5)

• Metastability and Transient Effects in Vortex Matter Near a Decoupling Transition
• Vortex dynamics as a function of field orientation in BaFe1.9Ni0.1As2
• Dynamically Induced Locking and Unlocking Transitions in Driven Layered Systems with Quenched Disorder
• Decoupling and Depinning II: Flux lattices in disordered layered superconductors
• Peak Effect in Superconductors: Absence of Phase Transition and Possibility of Jamming in Vortex Matter