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We argue that the chaotic temperature effect predicted in Ising spin glassesshould be stronger when one considers continuous (XY, Heisenberg) kind ofspins, due to bigger entropic fluctuations. We then discuss the behavior of 3dspin glasses using the Migdal-Kadanoff Renormalization Group for Ising and XYspins, where we show explicitly that the chaotic length scale, the lengthbeyond which equilibrium configurations are completly reshuffled when onechanges temperature, could be far smaller for XY than for Ising spins. Theseresults could thus explain why experiments are seeing a stronger rejuvenationeffect for continuous spins.Comment: 7 pages, 6 figures, accepted for publicatio

On temperature chaos in Ising and XY spin glasses