Proton-induced reduction ofRs, Jc, andTc in YBa2Cu3O7−δ thin films
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We have explored the effect of 2-MeVH+ irradiation on the superconducting transport properties of thin films of YBa2Cu3O7−δ [Tc, Jc(B=0; 77 K, 4.2 K), andRs(36 GHz;T)]. The inductively measured critical temperatureTc changed slowly and uniformly (∼2 K per 1016/cm2) for fluences less than ∼3×1016/cm2. Beginning at ∼3–4×1016/cm2, the superconducting transition broadened and dropped more quickly with fluence. The critical current density measured at 77 and 4.2 K changed roughly linearly with fluence. The microwaveTc (as defined by the sharp transition inRs as a function of temperature) resembled the low-frequency inductiveTc measurement at low fluences but was depressed more strongly for large fluences. The residual surface resistance (∼6–10 mΩ) was not affected for fluences up to 5×1016/cm2. We have interpreted the sudden and reproducible reduction in the microwaveTc transition as a sensitive indicator of disruption in the copper-oxygen chain sublattice and compared the proton-induced change to that observed in oxygen gettering studies of bulk materials.
Key wordsThin films radiation damage surface resistance
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