Abstract
In highly anisotropic or layered high-${\mathit{T}}_{\mathit{c}}$ superconductors with magnetic field along the c axis, both pinning-caused and thermal fluctuations of the highly flexible vortex cores, or of chains of vortex dots, threading the cuperconducting layers may drastically reduce the variance \ensuremath{\sigma} of the magnetic-field fluctuation. In contrast, the fluctuations of the averaged flux lines (smoothed over the in-plane penetration depth \ensuremath{\lambda}) increase \ensuremath{\sigma}. As a consequence, muon-spin-rotation lines may be sharpened not only the thermal motional narrowing, but also by pinning-caused static disorder.
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