Abstract
Abstract In polycrystalline samples of the superconducting oxide La1.85Sr0.15CuO4, the substantial substitution of 18O for 16O causes a small downward shift in the superconducting transition temperature Tc. Although Tc(onset) measured resistively differs by as much as two Kelvin from that measured magnetically, the two measurement methods yield comparable Tc shifts upon isotope substitution. Samples with different superconducting phases (as evidenced by resistive fine structure in the transition region) show similar isotope shifts for different phases. We determine an overall oxygen isotope shift in La1.85Sr0.15CuO4 corresponding to α = 0.140±.008, where Tc∼M−α and M is the oxygen mass.
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