J S Gardner et al 2005 J. Phys.: Condens. Matter 17 7089 doi:10.1088/0953-8984/17/44/002
J S Gardner1,2, A L Cornelius3, L J Chang4,5, M Prager4, Th Brückel4 and G Ehlers6
Show affiliationsThe spin relaxation processes within the pyrochlore Ho2Ru2O7 have been investigated by neutron scattering and bulk property techniques. A single-ion process, that is thermally activated, dominates the spin–spin relaxation spectrum above 2 K. Assuming Arrhenius behaviour, we found an activation energy Δ = (329 ± 6) K and characteristic relaxation time τ0 = (5.2 ± 0.3) × 10−12 s in the paramagnetic state, akin to those found in the spin ice, Ho2Ti2O7. Atlow temperature (T<95 K) the activation energy lowers and below 20 K the entropy and ac susceptibility are similar to that observed in other spin ice compounds within a 10 kOe field.
75.30.Cr Saturation moments and magnetic susceptibilities
61.05.fg Neutron scattering (including small-angle scattering)
Issue 44 (9 November 2005)
Received 18 August 2005, in final form 27 September 2005
Published 17 October 2005
J S Gardner et al 2005 J. Phys.: Condens. Matter 17 7089
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