Peak Effect in Superconductors: Absence of Phase Transition and Possibility of Jamming in Vortex Matter

Abstract

The magnetic field $B$ dependence of the critical current $I_c$ for the vortex phase of a disordered superconductor is studied numerically at zero temperature. The $I_c(B)$ increases rapidly near the upper critical field $B_{c2}$ similar to the peak effect (PE) phenomenon observed in many superconductors. The real space configuration across the PE changes continuously from a partially ordered domain (polycrystalline) state into an amorphous state. The topological defect density $n_d(B)\sim e^{\alpha B^k}$ with $k>1$ for $B\ge 0.4B_{c2}$. There is no evidence of a phase transition in the vicinity of the PE suggesting that an order-disorder transition is not essential for the occurrence of the PE phenomenon. An alternative view is presented wherein the vortex system with high dislocation density undergoes jamming at the onset of the PE.

8 pages and 5 figures

References in corpus (6)

• Peak effect in single crystal MgB${}_2$ superconductor for $\mathbf{H}\parallel c$-axis
• STM Imaging of Flux Line Arrangements in the Peak Effect Regime
• Critical Dynamics of Burst Instabilities in the Portevin-Le Chatelier Effect
• Dynamic transition in driven vortices across the peak effect in superconductors
• Domain regime in two-dimensional disordered vortex matter
• Vortex dynamics and upper critical fields in ultrathin Bi films

Cited by in corpus (1)

• Comparatively High In-Field Critical Current in Type-II Superconductors from Heterogeneous Columnar Pins: A Molecular Dynamics Study