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Kagomé Ice State in the Dipolar Spin Ice Dy2Ti2O7

Y. Tabata, H. Kadowaki, K. Matsuhira, Z. Hiroi, N. Aso, E. Ressouche, and B. Fåk
Phys. Rev. Lett. 97, 257205 – Published 21 December 2006
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Abstract

We have investigated the kagomé ice behavior of the dipolar spin-ice compound Dy2Ti2O7 in a magnetic field along a [111] direction using neutron scattering and Monte Carlo simulations. The spin correlations show that the kagomé ice behavior predicted for the nearest-neighbor interacting model, where the field induces dimensional reduction and spins are frustrated in each two-dimensional kagomé lattice, occurs in the dipole interacting system. The spins freeze at low temperatures within the macroscopically degenerate ground states of the nearest-neighbor model.

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  • Received 13 July 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.257205

©2006 American Physical Society

Authors & Affiliations

Y. Tabata1, H. Kadowaki2, K. Matsuhira3, Z. Hiroi4, N. Aso5, E. Ressouche6, and B. Fåk6

  • 1Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
  • 2Department of Physics, Tokyo Metropolitan University, Hachioji-shi, Tokyo 192-0397, Japan
  • 3Department of Electronics, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
  • 4Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • 5NSL, Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 319-1106, Japan
  • 6CEA, Département de Recherche Fondamentale sur la Matiére Condensée, SPSMS, 38054 Grenoble, France

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Vol. 97, Iss. 25 — 22 December 2006

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Images

  • Figure 1
    Figure 1
    (a) The pyrochlore lattice is alternating stacking of kagomé and triangular layers along a [111] direction. (b) A spin configuration of the kagomé ice state is shown. (c) The observed [21] and calculated residual entropies are plotted as a function of magnetic field. The calculated entropy for the NN model [20] is S(T=0.1  K), which is temperature-dependent in the peaked region. Dotted lines represent the precise values of the spin-ice and kagomé ice states for the NN model [18, 19]. (d) Temperature dependence of observed [21] and calculated specific heat at H=0, 0.5, and 0.75 T.Reuse & Permissions
  • Figure 2
    Figure 2
    (I) HT phase diagram of Dy2Ti2O7 obtained from the magnetization and the specific heat measurements [21, 23]. The kagomé ice state is observed in the blue region. The red solid line represents the first-order spin-flop transition. (II)–(IV) Neutron intensity patterns in the scattering plane perpendicular to the [111] direction are shown for several temperatures and fields denoted by crosses in (I). In (II), experimental results for Dy2Ti2O7 are shown. Calculations using the MC simulation based on the dipolar and NN spin-ice models are shown in (III) and (IV), respectively.Reuse & Permissions
  • Figure 3
    Figure 3
    Q scans along the (h,−h,0) line through Q0 at H=0.5  T: (a) experimental and (b) MC simulation results based on the dipolar model. Curves are fits to Lorentzian functions. (c) Temperature dependence of the inverse correlation length ξ−1 obtained by the fits. The dotted lines are guides to eyes. The solid line represents the exponential T dependence exp(−Δ/2kBT) described in the text. (d) Q scan along the [111] direction from (21¯1¯) [Fig. 2IIb].Reuse & Permissions
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