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  Unconventional Magnetization Processes and Thermal Runaway in Spin-Ice Dy2Ti2O7

Slobinsky, D., Castelnovo, C., Borzi, R. A., Gibbs, A. S., Mackenzie, A. P., Moessner, R., et al. (2010). Unconventional Magnetization Processes and Thermal Runaway in Spin-Ice Dy2Ti2O7. Physical Review Letters, 105(26): 267205, pp. 1-4. doi:10.1103/PhysRevLett.105.267205.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-F28D-8 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-F290-F
Genre: Journal Article

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 Creators:
Slobinsky, D.1, Author
Castelnovo, C.1, Author
Borzi, R. A.1, Author
Gibbs, A. S.1, Author
Mackenzie, A. P.2, Author              
Moessner, R.1, Author
Grigera, S. A.1, Author
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1external, ou_persistent22              
2External Organizations, ou_persistent22              

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 Abstract: We investigate the nonequilibrium behavior of the spin-ice Dy2Ti2O7 by studying its magnetization as a function of the field sweep rate. Below the enigmatic "freezing" temperature T-equil approximate to 600 mK, we find that even the slowest sweeps fail to yield the equilibrium magnetization curve and instead give an initially much flatter curve. For higher sweep rates, the magnetization develops sharp steps accompanied by similarly sharp peaks in the temperature of the sample. We ascribe the former behavior to the energy barriers encountered in the magnetization process, which proceeds via flipping of spins on filaments traced out by the field-driven motion of the gapped, long-range interacting magnetic monopole excitations. The peaks in temperature result from the released Zeeman energy not being carried away efficiently; the resulting heating triggers a chain reaction.

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 Dates: 2010-12-30
 Publication Status: Published in print
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Title: Physical Review Letters
  Other : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 105 (26) Sequence Number: 267205 Start / End Page: 1 - 4 Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1