Thomas E. Karis, C. Mark Seymour, et al.
Rheologica Acta
The temperature dependence of the anisotropic lower critical fields Hc1 in single-crystal Y-Ba-Cu-O is determined from the onset of flux penetration in zero-field-cooled dc magnetization versus temperature from Tc down to 0.5Tc. An extended Bean-critical-state model is developed to define this onset consistently. The Hc1's are linear in temperature near Tc as in Ginzburg-Landau theory and consistent with a clean local-limit BCS form with extrapolated Hc1(T=0)=180 Oe for Hc^ and 530 Oe for Hc. © 1989 The American Physical Society.
Thomas E. Karis, C. Mark Seymour, et al.
Rheologica Acta
F.J. Himpsel, T.A. Jung, et al.
Surface Review and Letters
C.M. Brown, L. Cristofolini, et al.
Chemistry of Materials
P. Martensson, R.M. Feenstra
Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films