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Direct Observation of the Oxygen Isotope Effect on the In-Plane Magnetic Field Penetration Depth in Optimally DopedYBa2Cu3O7−δ
2004
Physical Review Letters
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We report the first direct observation of the oxygen-isotope (^16O/^18O) effect on the in-plane penetration depth λ_ab in a nearly optimally doped YBa_2Cu_3O_7-δ 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
doi:10.1103/physrevlett.92.057602
pmid:14995343
fatcat:atpaymfizzeslbyrk4wpgb7rjq