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We report the results of resistivity and magnetic susceptibility measurements in La_2-x{Sr}ₓCuO₄ for x{≤}0.3. The x=0.2 sample shows a superconducting transition at 36.2 K with a width of 1.4 K. The associated dc diamagnetic susceptibility (Meissner effect) is a large fraction (60%--70%) of the ideal value. We estimate the density of states from critical-field and resistivity data and suggest, by analogy to BaPb_1-x{Bi}ₓO₃, that conventional phonon-mediated superconductivity can account for the high Tc in this class of materials.
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Cava et al. (1987) studied this question.
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