Restoration of the third law in spin ice thin films.
Restoration of the third law in spin ice thin films.
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DOI:
10.1038/ncomms4439
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发表时间:
2014-03-12
影响因子:
16.6
通讯作者:
Bramwell, S. T.
中科院分区:
文献类型:
--
作者:
Bovo, L.;Moya, X.;Prabhakaran, D.;Soh, Yeong-Ah;Boothroyd, A. T.;Mathur, N. D.;Aeppli, G.;Bramwell, S. T.
A characteristic feature of spin ice is its apparent violation of the third law of thermodynamics. This leads to a number of interesting properties including the emergence of an effective vacuum for magnetic monopoles and their currents – magnetricity. Here we add a new dimension to the experimental study of spin ice by fabricating thin epitaxial films of Dy2Ti2O7, varying between 5 and 60 monolayers on an inert substrate. The films show the distinctive characteristics of spin ice at temperatures >2 K, but at lower temperature we find evidence of a zero entropy state. This restoration of the third law in spin ice thin films is consistent with a predicted strain-induced ordering of a very unusual type, previously discussed for analogous electrical systems. Our results show how the physics of frustrated pyrochlore magnets such as spin ice may be significantly modified in thin-film samples. In bulk, the spin ice Dy2Ti2O7 has posed an enigma because – due to its slow dynamics – it is unclear whether and how the material will reach a zero entropy state at zero temperature. Here, the authors show that in thin films of Dy2Ti2O7 a zero entropy state is induced at 0.4 K, plausibly by lattice strain.
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影响因子:
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作者:
通讯作者:
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通讯作者:
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