Abstract
We argue that the chaotic temperature effect predicted in Isingspin glasses should be stronger when one considers continuous(XY, Heisenberg) kind of spins, due to bigger entropicfluctuations. We then discuss the behavior of 3d spin glassesusing the Migdal-Kadanoff Renormalization Group for Ising andXY spins, where we show explicitly that the chaotic lengthscale, the length beyond which equilibrium configurations arecompletly reshuffled when one changes temperature, could be farsmaller for XY than for Ising spins. These results could thusexplain why experiments are seeing a stronger rejuvenation effectfor continuous spins.
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