Abstract
The reversible magnetization measurements with applied field parallel to the c-axis were carried out for a series of Bi 2Sr 2CaCu 2O 8+ δ (Bi2212) single crystals with different oxygen content varying from underdoped to overdoped states, from which the doping dependence of penetration depth and n s/ m * can be obtained. It was firstly found in this system that with increasing oxygen content, the value of n s/ m * increases in the underdoped region and reaches a maximum at the optimal doping, then decreases in the overdoped region. The observed deviation from the linear relationship of T c∝ n s/ m * in the underdoped region can be regarded to be due to the structural distortion and the disorder scattering, while the decrease of n s/ m * in the overdoped region is suggested to be due to the phase-separation related pair breaking.
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