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Suppression of Pauling's residual entropy in the dilute spin ice (Dy1-xYx)2Ti2O7

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Valldor,  M.
Martin Valldor, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Scharffe, S., Breunig, O., Cho, V., Laschitzky, P., Valldor, M., Welter, J. F., et al. (2015). Suppression of Pauling's residual entropy in the dilute spin ice (Dy1-xYx)2Ti2O7. Physical Review B, 92(18): 180405, pp. 1-5. doi:10.1103/PhysRevB.92.180405.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-1D7E-B
Abstract
Around 0.5 K, the entropy of the spin ice Dy2Ti2O7 has a plateaulike feature close to Pauling's residual entropy derived originally for water ice, but an unambiguous quantification towards lower temperature is prevented by ultraslow thermal equilibration. Based on the specific-heat data of (Dy1-xYx)(2)Ti2O7 we analyze the influence of nonmagnetic dilution on the low-temperature entropy. With increasing x, the ultraslow thermal equilibration rapidly vanishes, the low-temperature entropy systematically decreases, and its temperature dependence strongly increases. These data suggest that a nondegenerate ground state is realized in (Dy1-xYx)(2)Ti2O7 for intermediate dilution. This contradicts the expected zero-temperature residual entropy obtained from a generalization of Pauling's theory for dilute spin ice, but is supported by Monte Carlo simulations.