I. Ciccarello et al., DYNAMICS OF FLUXONS IN Y1-BA2-CU3-O7 SINGLE-CRYSTALS, Nuovo cimento della Societa italiana di fisica. D, Condensed matter,atomic, molecular and chemical physics, biophysics, 15(2-3), 1993, pp. 429-433
Evidence is given that in Y1-Ba2-Cu3-O7 Single crystals a critical sta
te is developed on increasing (or decreasing) the applied field H-0, o
nly when H-0 is parallel to the crystal c-axis. An <<irreversibility>>
line in the (H, T)-plane can be drawn where the irreversibility of th
e second-harmonic response sets in.