c-axis penetration depth in Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ single crystals measured by ac-susceptibility and cavity perturbation technique

The $c$ -axis penetration depth $Δ λ_{c}$ in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ (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 $Δ λ_{c} (T) \propto T$ in the temperature range T<0.5 T_c. Electrodynamic analysis of the impedance anisotropy has allowed us to estimate $λ_{c} (0) \approx 50 μ$ m in BSCCO crystals overdoped with oxygen ( $T_{c} \approx 84$ K) and $λ_{c} (0) \approx 150 μ$ m at the optimal doping level ( $T_{c} \approx 90$ K).

c-axis penetration depth in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ single crystals measured by ac-susceptibility and cavity perturbation technique

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c-axis penetration depth in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ single crystals measured by ac-susceptibility and cavity perturbation technique

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c-axis penetration depth in Bi22​Sr22​CaCu22​O8+δ8+δ​ single crystals measured by ac-susceptibility and cavity perturbation technique

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c-axis penetration depth in Bi22​Sr22​CaCu22​O8+δ8+δ​ single crystals measured by ac-susceptibility and cavity perturbation technique

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c-axis penetration depth in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ single crystals measured by ac-susceptibility and cavity perturbation technique

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c-axis penetration depth in Bi $_{2}$ Sr $_{2}$ CaCu $_{2}$ O $_{8 + δ}$ single crystals measured by ac-susceptibility and cavity perturbation technique

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