Quantum-Classical Reentrant Relaxation Crossover in [Formula presented] Spin Ice

J. Snyder, B. G. Ueland, J. S. Slusky, H. Karunadasa, R. J. Cava, Ari Mizel, P. Schiffer

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

We have studied spin relaxation in the spin ice compound [Formula presented] through measurements of the ac magnetic susceptibility. While the characteristic spin-relaxation time ([Formula presented]) is thermally activated at high temperatures, it becomes almost temperature independent below [Formula presented]. This behavior, combined with nonmonotonic magnetic field dependence of [Formula presented], indicates that quantum tunneling dominates the relaxational process below that temperature. As the low-entropy spin ice state develops below [Formula presented], [Formula presented] 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 strongly correlated.

Original languageEnglish (US)
JournalPhysical review letters
Volume91
Issue number10
DOIs
StatePublished - Sep 5 2003

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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