Large low-frequency fluctuations in the velocity of a driven vortex lattice in a single crystal of 2H-NbSe2 superconductor

Phys Rev Lett. 2009 Oct 16;103(16):167001. doi: 10.1103/PhysRevLett.103.167001. Epub 2009 Oct 15.

Abstract

The driven state of a well-ordered flux line lattice in a single crystal of 2H-NbSe2 in the time domain has revealed the presence of substantial fluctuations in velocity, with large and distinct time periods ( approximately seconds). A superposition of a periodic drive in the driven vortex lattice causes distinct changes in these fluctuations. We propose that prior to the onset of the peak effect there exists a heretofore unexplored regime of coherent dynamics, with unexpected behavior in velocity fluctuations.