Physics – Condensed Matter – Superconductivity
Scientific paper
2000-06-23
JETP Lett., 71, 92, 2000
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures
Scientific paper
10.1134/1.568288
The $c$-axis penetration depth $\Delta\lambda_c$ in Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ (BSCCO) single crystals as a function of temperature has been determined using two techniques, namely, measurements of the ac-susceptibility at a frequency of 100 kHz and the surface impedance at 9.4 GHz. Both techniques yield an almost linear function $\Delta\lambda_c(T)\propto T$ in the temperature range T<0.5 T_c. Electrodynamic analysis of the impedance anisotropy has allowed us to estimate $\lambda_c(0)\approx 50 \mu$m in BSCCO crystals overdoped with oxygen ($T_c\approx 84$ K) and $\lambda_c(0)\approx 150 \mu$m at the optimal doping level ($T_c\approx 90$ K).
Bontemps Nicole
Buzdin Alexandre
Daumens Michel
Enriquez Hanna
Nefyodov Yu. A.
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