Anisotropy of the lower critical field, magnetic penetration depth, and equilibrium shielding current in single-crystal YBa2Cu3O7δ

Abstract
Magnetization measurements at 11 K are used to obtain anisotropic Hc1 values for fields along the c direction and in the basal plane of single crystals of YBa2Cu3O7δ. The anisotropic magnetic penetration depth and equilibrium shielding currents at Hc1 are derived and analyzed within effective-mass theory.