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Abstract:
The resistive upper critical field of overdoped single crystals of
Tl2Ba2CuO6 has been measured from the zero field transition temperature
T(c)(0) (approximately 20 K) to temperatures as low as 12 mK,
corresponding to less than 0.001T(c)(0). In sharp contrast to the
predictions of standard theories of superconductivity, the critical
field is found to rise steeply with positive curvature as the
temperature is reduced, and no sign of saturation is observed down to
the lowest temperatures reached.
