Refrustration and competing orders in the prototypical Dy2Ti2O7 spin ice material

P. Henelius, T. Lin, M. Enjalran, Z. Hao, J. G. Rau, J. Altosaar, F. Flicker, Taras Yavorskyi, M. J. P. Gingras

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Abstract

Spin ices, frustrated magnetic materials analogous to common water ice, have emerged over the past 15 years as exemplars of high frustration in three dimensions. Recent experimental developments aimed at interrogating anew the low-temperature properties of these systems, in particular whether the predicted transition to long-range order occurs, behoove researchers to scrutinize our current dipolar spin ice model description of these materials. In this work, we do so by combining extensive Monte Carlo simulations and mean-field theory calculations to analyze data from previous magnetization, diffuse neutron scattering, and specific-heat measurements on the paradigmatic Dy2Ti2O7 spin ice material. In this work, we also reconsider the possible importance of the nuclear specific heat Cnuc in Dy2Ti2O7. We find that Cnuc is not entirely negligible below a temperature ∼0.5 K and must therefore be taken into account in a quantitative analysis of the calorimetric data of this compound below that temperature. We find that in this material, small effective spin-spin exchange interactions compete with the magnetostatic dipolar interaction responsible for the main spin ice phenomenology. This causes an unexpected “refrustration” of the long-range order that would be expected from the incompletely self-screened dipolar interaction and which positions the material at the boundary between two competing classical long-range-ordered ground states. This allows for the manifestation of new physical low-temperature phenomena in Dy2Ti2O7, as exposed by recent specific-heat measurements. We show that among the four most likely causes for the observed upturn of the specific heat at low temperature [an exchange-induced transition to long-range order, quantum non-Ising (transverse) terms in the effective spin Hamiltonian, the nuclear hyperfine contribution, and random disorder], only the last appears to be reasonably able to explain the calorimetric data.
Original languageEnglish
Article number024402
JournalPhysical Review B
Volume93
DOIs
Publication statusPublished - 7 Jan 2016

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Ice
ice
Specific heat
Thermal variables measurement
specific heat
Low temperature phenomena
Low temperature properties
heat measurement
Hamiltonians
nuclear heat
Mean field theory
Magnetostatics
Magnetic materials
Exchange interactions
Neutron scattering
causes
spin exchange
Temperature
Ground state
interactions

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Henelius, P., Lin, T., Enjalran, M., Hao, Z., Rau, J. G., Altosaar, J., ... Gingras, M. J. P. (2016). Refrustration and competing orders in the prototypical Dy2Ti2O7 spin ice material. Physical Review B, 93, [024402]. https://doi.org/10.1103/PhysRevB.93.024402

Refrustration and competing orders in the prototypical Dy2Ti2O7 spin ice material. / Henelius, P.; Lin, T.; Enjalran, M.; Hao, Z.; Rau, J. G.; Altosaar, J.; Flicker, F.; Yavorskyi, Taras; Gingras, M. J. P.

In: Physical Review B, Vol. 93, 024402, 07.01.2016.

Research output: Contribution to journalArticle

Henelius, P, Lin, T, Enjalran, M, Hao, Z, Rau, JG, Altosaar, J, Flicker, F, Yavorskyi, T & Gingras, MJP 2016, 'Refrustration and competing orders in the prototypical Dy2Ti2O7 spin ice material' Physical Review B, vol. 93, 024402. https://doi.org/10.1103/PhysRevB.93.024402
Henelius, P. ; Lin, T. ; Enjalran, M. ; Hao, Z. ; Rau, J. G. ; Altosaar, J. ; Flicker, F. ; Yavorskyi, Taras ; Gingras, M. J. P. / Refrustration and competing orders in the prototypical Dy2Ti2O7 spin ice material. In: Physical Review B. 2016 ; Vol. 93.
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