Superconducting Volume Fraction in Overdoped Regime of La2-xSrxCuO4: Implication for Phase Separation from Magnetic-Susceptibility Measurement
Y. Tanabe, T. Adachi, T. Noji, Y. Koike
Abstract
We have grown a single crystal of La2-xSrxCuO4 in which the Sr concentration, x, continuously changes from 0.24 to 0.29 in the overdoped regime and obtained many pieces of single crystals with different x values by slicing the single crystal. From detailed measurements of the magnetic susceptibility, chi, of each piece, it has been found that the absolute value of chi at the measured lowest temperature 2 K, |chi2K|, on field cooling rapidly decreases with increasing x as well as the superconducting (SC) transition temperature. As the value of |chi2K| is regarded as corresponding to the SC volume fraction in a sample, it has been concluded that a phase separation into SC and normal-state regions occurs in a sample of La2-xSrxCuO4 in the overdoped regime.
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