We present different techniques to study the dynamics of the vortex lattice
in NbSe2 single crystal samples. In the first set of experiments, we appli
ed a field parallel to the c crystalline axis and extended the Bitter decor
ation technique to the study of dynamic structures by imaging the lattice d
uring creep ("decoration during motion"). This method exposed a new smectic
phase and an anisotropic "crystal" at higher fields. In the second set, we
used a micro-mechanical high-e oscillator to study the mesoscopic flux dyn
amics along the crystallographic ab plane. In this case, we were able to ob
serve single vortex penetration, well described by a '1 + 1' -dimensional m
odel. (C) 2000 Published by Elsevier Science B.V. All rights reserved.