J.R. Thompson, Yang Ren Sun, et al.
Physica A: Statistical Mechanics and its Applications
We calculate the change in susceptibility resulting from a thin sheet with reduced penetration depth embedded perpendicular to the surface of an isotropic superconductor, in a geometry applicable to scanning superconducting quantum interference device microscopy, by numerically solving Maxwell's and London's equations using the finite-element method. The predicted stripes in susceptibility agree well in shape with the observations of Kalisky [Phys. Rev. B 81, 184513 (2010)] of enhanced susceptibility above twin planes in the underdoped pnictide superconductor Ba (Fe1-x Cox) 2As2. By comparing the predicted stripe amplitudes with experiment and using the London relation between penetration depth and superfluid density, we estimate the enhanced Cooper-pair density on the twin planes, and the barrier force for a vortex to cross a twin plane. Fits to the observed temperature dependence of the stripe amplitude suggest that the twin planes have a higher critical temperature than the bulk, although stripes are not observed above the bulk critical temperature. © 2010 The American Physical Society.
J.R. Thompson, Yang Ren Sun, et al.
Physica A: Statistical Mechanics and its Applications
Ranulfo Allen, John Baglin, et al.
J. Photopolym. Sci. Tech.
Thomas H. Baum, Carl E. Larson, et al.
Journal of Organometallic Chemistry
G. Will, N. Masciocchi, et al.
Zeitschrift fur Kristallographie - New Crystal Structures