C. Bergemann et al., SUPERCONDUCTING MAGNETIZATION ABOVE THE IRREVERSIBILITY LINE IN TL2BA2CUO6+DELTA, Physical review. B, Condensed matter, 57(22), 1998, pp. 14387-14396
Tl2Ba2CuO6+delta. There crystals with different levels of oxygen overd
oping were investigated in magnetic fields up to 10 T. In all cases, t
he magnetization above the irreversibility line was found to depart fr
om the behavior M similar to In(eta H-c2\H) of a simple London-like vo
rtex liquid. In particular, for a strongly overdoped (T-c =15 K) cryst
al, the remnant superconducting order above the irreversibility line i
s characterized by a linear diamagnetic response (M similar to H) that
persists well above T-c and also up to the highest field employed.