Abstract
Pinning force Fp variation with the magnetic field H and the angle α = ∠H, ab is investigated in crystals having different concentrations of point defects npd. Comparison between the functions Fp (H) and Fp (α) strongly suggests that the minimum position in the Fp (α) -curve corresponds to the angle αOD, which separates the ordered vortex lattice (VL) formed at α < αOD and the disordered VL formed at α > αOD. This conclusion is confirmed by variation in the E(J)-curve shape in the vicinity of the angle αOD, and by hysteresis behavior of the E(J)-curves measured for increased and decreased transport current at angles α > αOD. This order-disorder transition arises, because the elastic energy of the disordered VL decreases with an increased α, while the pinning energy is independent of α.
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