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Pauling Entropy, Me...
Pauling Entropy, Metastability, and Equilibrium in Dy2Ti2O7 Spin Ice
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- Giblin, S. R. (författare)
- Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales.
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- Twengström, Mikael, 1990- (författare)
- KTH,Fysik
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- Bovo, L. (författare)
- UCL, London Ctr Nanotechnol, 17-19 Gordon St, London WC1H 0AH, England.;UCL, Dept Phys & Astron, 17-19 Gordon St, London WC1H 0AH, England.;UCL, Dept Innovat & Enterprise, 90 Tottenham Court Rd, London W1T 4TJ, England.
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- Ruminy, M. (författare)
- Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland.
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- Bartkowiak, M. (författare)
- Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland.
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- Manuel, P. (författare)
- Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England.
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- Andresen, J. C. (författare)
- Ben Gurion Univ Negev, Dept Phys, IR-84105 Beer Sheva, Israel.
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- Prabhakaran, D. (författare)
- Univ Oxford, Phys Dept, Clarendon Lab, Oxford OX1 3PU, England.
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- Balakrishnan, G. (författare)
- Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England.
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- Pomjakushina, E. (författare)
- Paul Scherrer Inst, Lab Sci Dev, CH-5232 Villigen, Switzerland.
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- Paulsen, C. (författare)
- Univ Joseph Fourier, CNRS, Inst Neel, BP 166, F-38042 Grenoble, France.
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- Lhotel, E. (författare)
- Univ Joseph Fourier, CNRS, Inst Neel, BP 166, F-38042 Grenoble, France.
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- Keller, L. (författare)
- Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland.
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- Frontzek, M. (författare)
- Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN USA.
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- Capelli, S. C. (författare)
- Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England.
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- Zaharko, O. (författare)
- Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland.
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- McClarty, P. A. (författare)
- Max Planck Inst Phys Komplexer Syst, Nothnitzer Str 38, D-01187 Dresden, Germany.
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- Bramwell, S. T. (författare)
- UCL, London Ctr Nanotechnol, 17-19 Gordon St, London WC1H 0AH, England.;UCL, Dept Phys & Astron, 17-19 Gordon St, London WC1H 0AH, England.
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- Henelius, Patrik (författare)
- KTH,Fysik
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- Fennell, T. (författare)
- Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland.
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Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales Fysik (creator_code:org_t)
- American Physical Society, 2018
- 2018
- Engelska.
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Ingår i: Physical Review Letters. - : American Physical Society. - 0031-9007 .- 1079-7114. ; 121:6
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Determining the fate of the Pauling entropy in the classical spin ice material Dy2Ti2O7 with respect to the third law of thermodynamics has become an important test case for understanding the existence and stability of ice-rule states in general. The standard model of spin ice-the dipolar spin ice model-predicts an ordering transition at T approximate to 0.15 K, but recent experiments by Pomaranski et al. suggest an entropy recovery over long timescales at temperatures as high as 0.5 K, much too high to be compatible with the theory. Using neutron scattering and specific heat measurements at low temperatures and with long timescales ( 0.35 K/10(6) s and 0.5 K/10(5) s, respectively) on several isotopically enriched samples, we find no evidence of a reduction of ice-rule correlations or spin entropy. High-resolution simulations of the neutron structure factor show that the spin correlations remain well described by the dipolar spin ice model at all temperatures. Furthermore, by careful consideration of hyperfine contributions, we conclude that the original entropy measurements of Ramirez et al. are, after all, essentially correct: The short-time relaxation method used in that study gives a reasonably accurate estimate of the equilibrium spin ice entropy due to a cancellation of contributions.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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Giblin, S. R.
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Twengström, Mika ...
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Bovo, L.
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Ruminy, M.
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Bartkowiak, M.
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Manuel, P.
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visa fler...
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Andresen, J. C.
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Prabhakaran, D.
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Balakrishnan, G.
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Pomjakushina, E.
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Paulsen, C.
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Lhotel, E.
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Keller, L.
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Frontzek, M.
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Capelli, S. C.
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Zaharko, O.
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McClarty, P. A.
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Bramwell, S. T.
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Henelius, Patrik
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Fennell, T.
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