Abstract
We found two distinct maxima in the ac magnetic susceptibility χac ofdysprosium titanate pyrochlore Dy2Ti2O7. Their different frequencydependence of χac suggest the existence of two different types of dynamical behaviour. One of them, observed below 2 K is the relaxationbecoming very slow at lower temperature T, possibly related toa highly degenerate ground state (`spin ice' state). Another slowing down phenomenon is evident above~10 K. Surprisingly, however, there is no anomaly in the dc magneticsusceptibility at this temperature range. Analysing the frequency dependenceof χac, we found that in spite of a structurally ordered system themagnetic relaxation is well expressed by a Davidson-Cole formula, which ischaracterized by a wide distribution of the relaxation time τ to theshort-τ region and a temperature dependent cut-off, τc, in the slow relaxations. Themagnetic relaxation of the spin ice compound Dy2Ti2O7 is uniquely incontrast with known slow dynamics.
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