Quantum-Classical Reentrant Relaxation Crossover in Dy2Ti2O7 Spin-Ice

Details Quantum-Classical Reentrant Relaxation Crossover in Dy2Ti2O7 Spin-Ice Quantum-Classical Reentrant Relaxation Crossover in Dy2Ti2O7 Spin-Ice

2003-02-21

arxiv.org/abs/cond-mat/0302453v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.91.107201

We have studied spin relaxation in the spin ice compound Dy2Ti2O7 through measurements of the a.c. magnetic susceptibility. While the characteristic spin relaxation time is thermally activated at high temperatures, it becomes almost temperature independent below Tcross ~ 13 K, suggesting that quantum tunneling dominates the relaxation process below that temperature. As the low-entropy spin ice state develops below Tice ~ 4 K, the spin relaxation time increases sharply with decreasing temperature, suggesting the emergence of a collective degree of freedom for which thermal relaxation processes again become important as the spins become highly correlated.

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