Abstract
The low-${T}_{c}$ layered superconductor $2H\ensuremath{-}\mathrm{Nb}{\mathrm{Se}}_{2}$ shows remarkable results for free flux-flow Hall effect. At low magnetic fields, the Nozi\`eres-Vinen result of a field-independent Hall angle appears to hold. At larger fields, a marked departure occurs leading to an extremely sharp and pronounced minimum slightly below ${H}_{c2}$, unaccounted for in the standard theoretical models. The results suggest the existence of collective dynamics and phase transitions (such as melting) in a clean flux line lattice.
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