Torque in the irreversible regime on oriented YBa2Cu3O7 crystals

Abstract
Torque measurements made at different temperatures below Tc show a gradual crossover from reversible to mainly irreversible behavior as the temperature is lowered. The irreversible term at low temperature shows a strong peak for the field oreintation near the ab plane, which can be interpreted as being due to a Bean-mechanism effect. The data indicate that a reversible term, due to disalignment of the flux lines, is still present at low temperatures.