Measurements of the absolute value of the penetration depth in high-Tc superconductors using a low-Tc superconductive coating

R. Prozorov, R. W. Giannetta, A. Carrington, P. Fournier, R. L. Greene, P. Guptasarma, D. G. Hinks, A. R. Banks

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A method is presented to measure the absolute value of the London penetration depth, λ(T = O), from the frequency shift of a resonator. The technique involves coating a high-Tc superconductor with film of low-Tc material of known thickness and penetration depth. The method is applied to obtain λ(YBa2Cu3O7 -δ) ≈ 1460 ± 150 Å, λ(Bi2Sr2CaCu2O8 + δ) ≈ 2690 ± 150 Å and λ(Pr1.85Ce0.15CuO4 - δ) ≈ 2790 ± 150 Å. λ(YBa2Cu3O7 - δ) from this method is very close to that obtained by several other techniques. For both Bi2Sr2CaCu2O8 + δ and Pr1.85Ce0.15CuO4 - δ the values exceed those obtained by other methods.

Original languageEnglish (US)
Pages (from-to)4202-4204
Number of pages3
JournalApplied Physics Letters
Issue number25
StatePublished - Dec 18 2000

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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