Visualization of interacting crossing vortex lattices in the presence of quenched disorder.
We have imaged interacting crossing pancake vortex (PV) and Josephson vortex (JV) lattices in highly anisotropic Bi2Sr2CaCu2O(8+delta) single crystals under tilted magnetic fields. The dependence of vortex structures on in-plane field is in good quantitative agreement with theoretical predictions, yielding an almost temperature-independent anisotropy parameter of gamma=640+/-25. We directly confirm that the PV/JV attraction arises from small PV displacements in the presence of JV supercurrents and demonstrate how the existence of quenched disorder leads to indirect JV pinning and dynamic vortex fragmentation.
Grigorenko
A N
AN
Department of Physics, University of Bath, Claverton Down, Bath, BA2 7AY, United Kingdom.
Bending
S J
SJ
Koshelev
A E
AE
Clem
John R
JR
Tamegai
T
T
Ooi
S
S