Abstract

The effects of oxygen content on the anisotropic resistivity and Cu 2+ localized spin moments have been studied for the Bi 2Sr 2CaCu 2O 8 + x single crystals. It was found that the in-plane and out-of-plane resistivities ( ϱ ab and ϱ c ), as well as the electron spin resonance (ESR) signals decrease with increasing oxygen contents from underdoping to overdoping states. We believe that the in-plane resistivity upturn in an underdoped region is closely related to the carrier localization, and the scattering of spin fluctuations plays an important role in the charge transport properties. On the origin of c-axis resistivity, we should take into account the scattering in the `barrier' layer between CuO 2 ‘cells’ and the scattering or fluctuations in the planes.

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