We investigated the irreversibility lines (H-irr) and their correlation wit
h lock-in transition on over-doped Tl2Ba2CuO2 single crystals using magneto
-resistive measurement results. The lock-in transition is observed only abo
ve the irreversibility line H-irr perpendicular to(t) for magnetic field H-
parallel to c-axis, where t = T/T-c is the reduced temperature. (C) 2001 El
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