A. Gangulee, F.M. D'Heurle
Thin Solid Films
Magnetization measurements on HgBa2CuO4+δ microcrystals with different oxygen doping δ were performed using a miniaturized torque sensor. From angular dependent torque measurements the doping dependence of the effective mass anisotropy γ = √mc/mab, of the in-plane penetration depth λab, and of the in-plane coherence length ξab was extracted. The anisotropy y increases monotonically with decreasing δ, suggesting a smooth 3D-2D cross-over in the superconducting properties on reducing the oxygen content. The increase of γ may be due to an increase of the effective mass of the charge carriers, which in the framework of a bipolaronic model can be explained by an increase of the polaron binding energy with reduced doping. © 1998 Elsevier Science B.V.
A. Gangulee, F.M. D'Heurle
Thin Solid Films
A. Nagarajan, S. Mukherjee, et al.
Journal of Applied Mechanics, Transactions ASME
Heinz Schmid, Hans Biebuyck, et al.
Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
Thomas H. Baum, Carl E. Larson, et al.
Journal of Organometallic Chemistry