Measurements of the absolute value of the penetration depth in high-$ T_c$ superconductors using a tunnel diode resonator

Details Measurements of the absolute value of the penetration depth in high-$ T_c$ superconductors using a tunnel diode resonator Measurements of the absolute value of the penetration depth in high-$ T_c$ superconductors using a tunnel diode resonator

2000-07-02

arxiv.org/abs/cond-mat/0007013v1

Physics

Condensed Matter

Superconductivity

RevTex 4 (beta 4). 4 pages, 4 EPS figures. Submitted to Appl. Phys. Lett

Scientific paper

10.1063/1.1328362

A method is presented to measure the absolute value of the London penetration depth, $\lambda$, from the frequency shift of a resonator. The technique involves coating a high-$T_c$ superconductor (HTSC) with film of low - Tc material of known thickness and penetration depth. The method is applied to measure London penetration depth in YBa2Cu3O{7-\delta} (YBCO) Bi2Sr2CaCu2O{8+\delta} (BSCCO) and Pr{1.85}Ce{0.15}CuO{4-\delta}$ (PCCO). For YBCO and BSCCO, the values of $\lambda (0)$ are in agreement with the literature values. For PCCO $\lambda \approx 2790$ \AA, reported for the first time.

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