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

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.

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 Creators:
Scharffe, S.1, Author
Breunig, O.1, Author
Cho, V.1, Author
Laschitzky, P.1, Author
Valldor, M.2, Author              
Welter, J. F.1, Author
Lorenz, T.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Martin Valldor, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863454              

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 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.

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Language(s): eng - English
 Dates: 2015-11-052015-11-05
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 92 (18) Sequence Number: 180405 Start / End Page: 1 - 5 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008