Abstract
Superconducting diamagnetic properties have been extensively investigated on Bi 2Sr 2-xLa xCuO 6 and La 2-xSr xCuO 4 single crystals. Strong evidence for electronic macroscopic phase separation was found in overdoped samples of both systems revealing intrinsic inhomogeneities. It is found that because of the phase separation in the overdoped region, the criticality of superconductivity becomes the same as in the underdoped region albeit very different normal state properties between these two regions. This gives a strong indication that the superconductivity in underdoped region and overdoped region may have the same underlying mechanism (pairing and phase coherence). Our conclusion here will have important implication for how we view the high temperature superconductors.
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