2003/05/20 by R. Khasanov, D. G. Eshchenko, H. Luetkens +10 · 4 citations
Engineering · Physics and Astronomy · #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.92.057602
published as Phys. Rev. Lett., v. 92, 057602 (2004). · 4 pages, 2 figures
arxiv created 2003/05/20 · openalex publication_date 2004/02/06 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report the first direct observation of the oxygen-isotope (16O/18O) effect on the in-plane penetration depth \ensuremathλab in a nearly optimally doped YBa2Cu3O_7\ensuremath-\ensuremathδ film using the novel low-energy muon-spin rotation technique. Spin-polarized low-energy muons are implanted in the film at a known depth z beneath the surface and precess in the local magnetic field B(z). This feature allows us to measure directly the profile B(z) of the magnetic field inside the superconducting film in the Meissner state and to make a straightforward determination of \ensuremathλab. A substantial isotope shift \ensuremathΔ\ensuremathλab/\ensuremathλab=2.8(1.0)% at 4 K is observed, implying that the in-plane effective supercarrier mass mab* is oxygen-isotope dependent with \ensuremathΔmab*/mab*=5.5(2.0)%. These results are in good agreement with magnetization measurements on powder samples.