Ferromagnetism in nanotubes controlled by electron/hole doping
L. Krusin-Elbaum
INTERMAG 2006
Orders-of-magnitude enhancements of persistent currents J are reported in YBa2Cu3O7−Δ with columnar defects arranged in a variety of splayed configurations. The largest J is obtained for a planar distribution Ppl(Θ), with a splay angle Θopt =+/−5°. A comparison of Ppl(Θ) and a Gaussian distribution PG(Θ) suggests that pinning by the latter is controlled by large-angle tails of the Gaussian which appear to enhance thermal creep rate. Numerical simulations confirm the existence of the regimes where vortex motion is promoted rather than suppressed by splay. © 1996 The American Physical Society.
L. Krusin-Elbaum
INTERMAG 2006
C. Cabral, L. Krusin-Elbaum, et al.
Applied Physics Letters
A.D. Marwick, L. Civale, et al.
Nuclear Inst. and Methods in Physics Research, B
J.R. Thompson, J.G. Ossandon, et al.
Physica C: Superconductivity and its Applications