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?" /> 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?" />

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Journal of Physics: Condensed Matter

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G Ehlers et al 2003 J. Phys.: Condens. Matter 15 L9 doi:10.1088/0953-8984/15/2/102

Dynamical crossover in 'hot' spin ice

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G Ehlers1, A L Cornelius2, M Orendác3, M Kajnaková3, T Fennell4, S T Bramwell5,7 and J S Gardner6,7

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Abstract References Cited By

LETTER TO THE EDITOR

The 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?


PACS

75.20.-g Diamagnetism, paramagnetism, and superparamagnetism

75.30.Wx Spin crossover

75.30.Cr Saturation moments and magnetic susceptibilities

Subjects

Condensed matter: electrical, magnetic and optical

Dates

Issue 2 (22 January 2003)

Received 2 October 2002

Published 20 December 2002



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