Magnetic field dependence of the oxygen isotope effect on the magnetic penetration depth in hole-doped cuprate superconductors
R. Khasanov, A. Shengelaya, D Di Castro, D. G. Eshchenko, I. M. Savich, K. Conder, E. Pomjakushina, J. Karpinski, S. Kazakov, H. Keller
Abstract
The magnetic field dependence of the oxygen-isotope (16O/18O) effect (OIE) on the in-plane magnetic field penetration depth λab was studied in the hole-doped high-temperature cuprate superconductors YBa2Cu4O8, Y0.8Pr0.2Ba2Cu3O7-δ, and Y0.7Pr0.3Ba2Cu3O7-δ. It was found that λab for the 16O substituted samples increases stronger with increasing magnetic field than for the 18O ones. The OIE on λab decreases by more than a factor of two with increasing magnetic field from μ0H=0.2 T to μ0H=0.6 T. This effect can be explained by the isotope dependence of the in-plane charge carrier mass mab.
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