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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
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Abstract

The magnetic field dependence of the oxygen-isotope (^{16}O/^{18}O) effect (OIE) on the in-plane magnetic field penetration depth λ_{ab} was studied in the hole-doped high-temperature cuprate superconductors YBa_2Cu_4O_8, Y_0.8Pr_0.2Ba_2Cu_3O_7-δ, and Y_0.7Pr_0.3Ba_2Cu_3O_7-δ. It was found that λ_ab for the ^{16}O substituted samples increases stronger with increasing magnetic field than for the ^{18}O ones. The OIE on λ_ab decreases by more than a factor of two with increasing magnetic field from μ_0H=0.2 T to μ_0H=0.6 T. This effect can be explained by the isotope dependence of the in-plane charge carrier mass m^\ast_{ab}.

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R. Khasanov, A. Shengelaya, D Di Castro, D. G. Eshchenko, I. M. Savich, K. Conder, E. Pomjakushina, J. Karpinski, S. Kazakov, H. Keller. 2006-10-18. Magnetic field dependence of the oxygen isotope effect on the magnetic penetration depth in hole-doped cuprate superconductors. https://doi.org/10.1103/physrevb.75.060505

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