Slow Relaxation due to Entropy Effect – Entropic Slowing Down –

We study entropic slowing down in a decorated bond system. Though it is commonly known that complicate energy landscape in random spin systems causes slow relaxations, we find that the slowing down also appears due to an entropic effect even if the energy barrier between the stable and the metastable states is very small. The concept of the entropic slowing down is proposed by using a decorated bond which has a large number of degeneracy near some specific states. In this system, we find that the relaxation time increases exponentially with the number of decoration spins.