Angular dependence of I-c(H) in Bi2Sr2Ca2Cu3Ox tapes

Measurements of the critical current, I-c, as a function of the angle between the applied magnetic field and the face of a Bi2Sr2Ca2Cu3Ox tape have been performed. Defining theta as the angle between the basal plane and the magnetic field but perpendicular to the current, the data do not scale well with H sin(theta). For a given value of magnetic field, as theta increases I-c decreases much faster than would be expected from a simple sin(theta) law. This paper shows that other scaling functions, based on the anisotropy of the critical field, fit the data much better over the entire angular range.