Oxygen isotope effect on superconductivity and magnetism in Y1-xPrxBa2Cu3O7-δ
Abstract
Oxygen isotope (16O/18O) effects (OIE's) on the superconducting transition (Tc), the spin-glass ordering (Tg), and the antiferromagnetic ordering (TN) temperatures were studied for Y1-xPrxBa2Cu3O7-δ as a function of Pr content (0.0≤ x ≤ 1.0). The OIE on Tc increases with increasing x up to x≈0.55, where superconductivity disappears. For decreasing x the OIE's on TN and Tg increase down to x≈ 0.7 where antiferromagnetic order and down to x≈0.3 where spin-glass behavior vanish, respectively. The OIE's on Tg and TN are found to have opposite signs as compared to the OIE on Tc. All OIE's are suggested to arise from the isotope dependent mobility (kinetic energy) of the charge carriers.
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