  Dissipative-free electric current flow is one of the most fascinating and
practically important property of superconductors. Theoretical consideration of
the charge carriers flow in infinitely long rectangular slab of superconductor
in the absence of external magnetic field (so called, self-field) is based on
an assumption that the charge carriers have rectilinear trajectories in the
direction of the current flow whereas the current density and magnetic flux
density are decaying towards superconducting slab with London penetration depth
as characteristic length. Here, we calculate charge particle trajectories (as
single electron/hole, as Cooper pair) at self-field conditions and find that
charge carriers do not follow intuitive rectilinear trajectories along the slab
surface, but instead ones have meander shape trajectories which cross the whole
thickness of the slab. Moreover, if the particle velocity is below some value,
the charge moves in opposite direction to nominal current flow. This
disturbance of the canonical magnetic flux density distribution and backward
movement of Cooper pairs can be entire mechanism for power dissipation in
superconductors.
