Change search
Refine search result
1 - 4 of 4
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1. Bovo, L.
    et al.
    Twengström, Mikael
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Petrenko, O. A.
    Fennell, T.
    Gingras, M. J. P.
    Bramwell, S. T.
    Henelius, P.
    Special temperatures in frustrated ferromagnets,Manuscript (preprint) (Other academic)
  • 2.
    Giblin, S. R.
    et al.
    Cardiff Univ, Sch Phys & Astron, Cardiff CF24 3AA, S Glam, Wales..
    Twengström, Mikael
    KTH, School of Engineering Sciences (SCI), Physics.
    Bovo, L.
    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..
    Ruminy, M.
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Bartkowiak, M.
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Manuel, P.
    Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England..
    Andresen, J. C.
    Ben Gurion Univ Negev, Dept Phys, IR-84105 Beer Sheva, Israel..
    Prabhakaran, D.
    Univ Oxford, Phys Dept, Clarendon Lab, Oxford OX1 3PU, England..
    Balakrishnan, G.
    Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England..
    Pomjakushina, E.
    Paul Scherrer Inst, Lab Sci Dev, CH-5232 Villigen, Switzerland..
    Paulsen, C.
    Univ Joseph Fourier, CNRS, Inst Neel, BP 166, F-38042 Grenoble, France..
    Lhotel, E.
    Univ Joseph Fourier, CNRS, Inst Neel, BP 166, F-38042 Grenoble, France..
    Keller, L.
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Frontzek, M.
    Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN USA..
    Capelli, S. C.
    Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England..
    Zaharko, O.
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    McClarty, P. A.
    Max Planck Inst Phys Komplexer Syst, Nothnitzer Str 38, D-01187 Dresden, Germany..
    Bramwell, S. T.
    UCL, London Ctr Nanotechnol, 17-19 Gordon St, London WC1H 0AH, England.;UCL, Dept Phys & Astron, 17-19 Gordon St, London WC1H 0AH, England..
    Henelius, Patrik
    KTH, School of Engineering Sciences (SCI), Physics.
    Fennell, T.
    Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland..
    Pauling Entropy, Metastability, and Equilibrium in Dy2Ti2O7 Spin Ice2018In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 6, article id 067202Article in journal (Refereed)
    Abstract [en]

    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.

  • 3. Giblin, S. R.
    et al.
    Twengström, Mikael
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    et al.,
    Pauling entropy, metastability and equilibrium in Dy2Ti2O7spin iceManuscript (preprint) (Other academic)
  • 4.
    Twengström, Mikael
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Bovo, L.
    Gingras, M. J. P.
    Bramwell, S. T.
    Henelius, Patrik
    KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    Microscopic aspects of magnetic lattice demagnetizing factors2017In: PHYSICAL REVIEW MATERIALS, ISSN 2475-9953, Vol. 1, no 4, article id 044406Article in journal (Refereed)
    Abstract [en]

    The demagnetizing factor N is of both conceptual interest and practical importance. Considering localized magnetic moments on a lattice, we show that for nonellipsoidal samples, N depends on the spin dimensionality (Ising, XY, or Heisenberg) and orientation, as well as the sample shape and susceptibility. The generality of this result is demonstrated by means of a recursive analytic calculation as well as detailed Monte Carlo simulations of realistic model spin Hamiltonians. As an important check and application, we also make an accurate experimental determination of N for a representative collective paramagnet (i.e., the Dy2Ti2O7 spin ice compound) and show that the temperature dependence of the experimentally determined N agrees closely with our theoretical calculations. Our conclusion is that the well-established practice of approximating the true sample shape with "corresponding ellipsoids" for systems with long-range interactions will in many cases overlook important effects stemming from the microscopic aspects of the system under consideration.

1 - 4 of 4
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf