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Abstract:
The dc-magnetization on high-quality single crystals of the title
organic superconductors reveal indications for strong thermal
fluctuations in fields perpendicular to the planes, i.e. a field-induced
rounding of the transition and a field-independent magnetization at
M*(T*,H) for H less than or equal to 10kOe. The mixed-state properties
are governed by an extended range in the H-T plane where the
magnetization is entirely reversible. The lower boundary of this range -
the so-called irreversibility line - follows an exponential T
dependence.
