  We report observation of the enhancement of superconductivity near lattice
dislocations and the absence of the strengthening of vortex pinning in
odd-parity superconductor Sr$_2$RuO$_4$, both surprising results in direct
contrast to the well known sensitivity of superconductivity in Sr$_2$RuO$_4$ to
disorder. The enhanced superconductivity appears to be related fundamentally to
the two-component nature of the superconducting order parameter, as revealed in
our phenomenological theory taking into account the effect of symmetry
reduction near a dislocation.
