Abstract
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 language | English (US) |
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Pages (from-to) | 4202-4204 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 77 |
Issue number | 25 |
DOIs | |
State | Published - Dec 18 2000 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)