By means of magnetization measurements we extend the observations of the ma
croturbulence phenomenon performed recently by several authors using magnet
o-optic (MO) imaging to a much wider temperature and field range. Having es
tablished the correlation between the MO and SQUID data on the same NdBa2Cu
3Oy Single crystals, fingerprints of this macro-turbulence are observed in
M(T) measurements and in M(H)-loops. (C) 2000 Elsevier Science B.V. All rig
hts reserved.