  We predict the occurrence of odd frequency equal-spin-triplet correlations at
a normal metal-superconductor junction. This result is significant because
equal-spin-triplet correlations are associated with the presence of
dissipation-less pure spin current. Inserting a spin-flipper at the interface
of a normal metal-superconductor junction excites equal-spin-triplet
correlations. The existence of odd frequency equal-spin-triplet correlations in
absence of odd frequency mixed spin-triplet correlations is the main take-home
message of this work. It tallies well with the measured local magnetization
density of states and spin-polarized local density of states at the interface.
The importance of spin-flip scattering to the obtained results is manifest when
we compare our normal metal-spin flipper-superconductor junction to other
hybrid junctions where either only spin mixing or both spin mixing and
spin-flip scattering are present.
