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We report the first direct observation of the oxygen-isotope($^{16}$O/$^{18}$O) effect on the in-plane penetration depth $\lambda_{ab}$ ina nearly optimally doped YBa$_2$Cu$_3$O$_{7-\delta}$ film using the novellow-energy muon-spin rotation technique. Spin polarized low energy muons areimplanted in the film at a known depth $z$ beneath the surface and precess inthe local magnetic field $B(z)$. This feature allows us to measure directly theprofile $B(z)$ of the magnetic field inside the superconducting film in theMeissner state and to make a model independent determination of $\lambda_{ab}$.A substantial isotope shift $\Delta\lambda_{ab}/\lambda_{ab}=2.8(7)$% at 4 K isobserved, implying that the in-plane effective supercarrier mass $m_{ab}^\ast$is oxygen-isotope dependent with $\Delta m_{ab}^\ast/m_{ab}^\ast = 5.5(1.4)%$.Comment: 4 pages, 2 figure

physical review letters

Direct Observation of the Oxygen Isotope Effect on the In-Plane Magnetic Field Penetration Depth in Optimally Doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">Y</mml:mi><mml:mi mathvariant="normal">B</mml:mi><mml:mi mathvariant="normal">a</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">u</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:…

Direct Observation of the Oxygen Isotope Effect on the In-Plane Magnetic Field Penetration Depth in Optimally DopedYBa2Cu3