Nonmonotonic relaxation of Campbell penetration depth from
creep-enhanced vortex pinning
Nonmonotonic relaxation of Campbell penetration depth from
creep-enhanced vortex pinning
We study the effects of flux creep on the linear AC response of the vortex lattice in a low-pinning Ca$_3$Ir$_4$Sn$_13$ superconductor by measuring the Campbell penetration depth, $\lambda_\rm \scriptscriptstyle C(T,H,t)$. Thermal fluctuations release vortices from shallow pinning sites, only for them to become re-trapped by deeper potential wells, causing an …