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The first penetration field H_{J}(T) of Josephson vortices is measuredthrough the onset of microwave absorption in the locked state, in slightlyoverdoped $\rm{Bi_{2}Sr_{2}CaCu_{2}O_{8+\delta}}$ single crystals (T_{c} ~ 84K). The magnitude of H_{J}(T) is too large to be accounted for by the firstthermodynamic critical field H_{c1}(T). We discuss the possibility of aBean-Livingston barrier, also supported by irreversible behavior upon fluxexit, and the role of defects, which relates H_{J}(T) to the c-axis penetrationdepth $\lambda_{c}(T)$. The temperature dependence of the latter, determined bya cavity perturbation technique and a theoretical estimate of thedefect-limited penetration field are used to deduce from H_{J}(T) the absolutevalue of $\lambda_{c}(0)=(35 \pm 15) \mu m$.Comment: 9 pages, 6 figure

physical review. b, condensed matter

Penetration of Josephson vortices and measurement of the<i>c</i>-axis penetration depth in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="…

Penetration of Josephson vortices and measurement of thec-axis penetration depth inBi2Sr2