Images of interlayer vortices andc-axis penetration depth of high-TcYBa2

The measurements on the magnetic image of interlayer vortices are performed for the high-${T}_{\mathrm{c}}$ ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}y}(110)$ thin film using a high sensitive scanning SQUID microscopy. Clear images of aligned giant interlayer vortices are observable. For the majority of vortices, using the London model, the $c$-axis penetration depth is estimated to be about $20\phantom{\rule{0.3em}{0ex}}\mathrm{\ensuremath{\mu}}\mathrm{m}$ at $3\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The temperature dependence of ${\ensuremath{\lambda}}_{\mathrm{c}}$ is obtained from the observed vortex images at different temperatures, whose behavior is in good agreement with those of the microwave cavity measurement.