  A low temperature model system consisting of a central spin coupled to a
spin-bath is studied to determine whether interaction among bath spins has an
effect on central spin dynamics. In the absence of intra-environmental
coupling, decoherence of the central spin is fast and irreversible. Strong
intra-environmental interaction results in an effective decoupling of the
central spin from the bath and suppression of decoherence. Weaker
intra-environmental coupling reduces but does not eliminate decoherence. We
believe that similar behaviour will be observed in any system with a
self-interacting environment.
