Dynamical crossover in 'hot' spin ice

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DOIResolve DOI: http://doi.org/10.1088/0953-8984/15/2/102
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TypeArticle
Journal titleJournal Of Physics. Condensed Matter
ISSN09538984
Volume15
Issue2
PagesL9L15
AbstractThe magnetic dynamics of the spin ice material Ho2Ti2O7 in its paramagnetic ('hot') phase have been investigated by a combination of neutron spin echo and ac-susceptibility techniques. Relaxation at high temperatures (T > 15 K) is proved to occur by a thermally activated single-ion process that is distinct from the process that dominates at lower temperatures (1 K < T < 15 K). It is argued that the low-temperature process must involve quantum mechanical spin tunnelling, as quasi-classical channels of relaxation are exhausted in this temperature range. Our results resolve a mystery in the physics of spin ice: why has a 15 K ac-susceptibility peak been observed in Dy2Ti2O7 but not in Ho2Ti2O7 or Ho2Sn2O7?
Publication date
AffiliationNational Research Council Canada
Peer reviewedNo
Identifier10451456
NPARC number12333560
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Record identifier5aedf9a2-5253-4742-a154-6a92e9d0e902
Record created2009-09-10
Record modified2016-05-09
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