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VOLUME 71 (2000) | ISSUE 2 | PAGE 132
c- axis penetration depth in Bi2Sr2CaCu2O8+δ single crystals measured by ac-susceptibility and cavity perturbation technique
PACS: 74.30.Ci, 74.70.Wz
The с-axis penetration depth AXC in Bi2Sr2CaCu208+i (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 AAC(T) α Τ in the temperature range Τ < 0.5 Tc. Electro dynamic analysis of the impedance anisotropy has allowed us to estimate Ac(0) « 50 μπι in BSCCO crystals overdoped with oxygen (Tc « 84 K) and Ac(0) ft* 150 μτη at the optimal doping level (Tc ft! 90 K).