Spin Correlations in Ho₂Ti₂O₇: a Dipolar Spin Ice System
Bramwell, S. T. · Harris, M. J. · Hertog, B. C. den · Gingras, M. J. P. · Gardner, J. S. · McMorrow, D. F. · Wildes, A. R. · Cornelius, A. L. · Champion, J. D. M. · Melko, R. G. · Fennell, T.
الأصل · EN
The pyrochlore material Ho₂Ti₂O₇ has been suggested to show ``spin ice'' behaviour. We present neutron scattering and specific heat results that establish unambiguously that Ho₂Ti₂O₇ exhibits spin ice correlations at low temperature. Diffuse magnetic neutron scattering from Ho₂Ti₂O₇ is found to be quite well described by a near neighbour spin ice model and very accurately described by a dipolar spin ice model. The heat capacity is well accounted for by the sum of a dipolar spin ice contribution and an expected nuclear spin contribution, known to exist in other Ho³⁺ salts. These results settle the question of the nature of the low temperature spin correlations in Ho₂Ti₂O₇ for which contradictory claims have been made.
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