Abstract
In order to investigate the inhomogeneity of the superconductivity, we have grown a large-sized single-crystal of La 2− x Sr x CuO 4 (LSCO), in which the Sr concentration, x, continuously changes in the underdoped regime, and measured the magnetic susceptibility on field cooling for several pieces of single crystal with different x values by slicing the single crystal. It has been found that the Meissner volume fraction, regarded as corresponding to the superconducting (SC) volume fraction in a sample, increases with increasing x. This suggests that a phase separation into SC and normal-state regions takes place in the underdoped regime as well as in the overdoped regime of LSCO.
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