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Gao S, Zaharko O, Tsurkan V, et al. Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr_{2}X_{4} (X=Se, S). Phys Rev Lett. 2018;120(13):137201doi: 10.1103/PhysRevLett.120.137201.
Gao, S., Zaharko, O., Tsurkan, V., Prodan, L., Riordan, E., Lago, J., Fåk, B., Wildes, A. R., Koza, M. M., Ritter, C., Fouquet, P., Keller, L., Canévet, E., Medarde, M., Blomgren, J., Johansson, C., Giblin, S. R., Vrtnik, S., Luzar, J., Loidl, A., Rüegg, C., & Fennell, T. (2018). Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr_{2}X_{4} (X=Se, S). Physical review letters, 120(13), 137201. https://doi.org/10.1103/PhysRevLett.120.137201
Gao, Shang, et al. "Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr_{2}X_{4} (X=Se, S)." Physical review letters vol. 120,13 (2018): 137201. doi: https://doi.org/10.1103/PhysRevLett.120.137201
Gao S, Zaharko O, Tsurkan V, Prodan L, Riordan E, Lago J, Fåk B, Wildes AR, Koza MM, Ritter C, Fouquet P, Keller L, Canévet E, Medarde M, Blomgren J, Johansson C, Giblin SR, Vrtnik S, Luzar J, Loidl A, Rüegg C, Fennell T. Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr_{2}X_{4} (X=Se, S). Phys Rev Lett. 2018 Mar 30;120(13):137201. doi: 10.1103/PhysRevLett.120.137201. PMID: 29694199.
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Phys Rev Lett. 2018 Mar 30;120(13):137201. doi: 10.1103/PhysRevLett.120.137201.

Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr_{2}X_{4} (X=Se, S).

Physical review letters

Shang Gao, O Zaharko, V Tsurkan, L Prodan, E Riordan, J Lago, B Fåk, A R Wildes, M M Koza, C Ritter, P Fouquet, L Keller, E Canévet, M Medarde, J Blomgren, C Johansson, S R Giblin, S Vrtnik, J Luzar, A Loidl, Ch Rüegg, T Fennell

Affiliations

  1. Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
  2. Department of Quantum Matter Physics, University of Geneva, CH-1211 Geneva, Switzerland.
  3. Experimental Physics V, University of Augsburg, D-86135 Augsburg, Germany.
  4. Institute of Applied Physics, Academy of Sciences of Moldova, MD-2028 Chisinau, Republic of Moldova.
  5. School of Physics and Astronomy, Cardiff University, CF24 3AA Cardiff, United Kingdom.
  6. Department of Inorganic Chemistry, Universidad del País Vasco (UPV-EHU), 48080 Bilbao, Spain.
  7. Institut Laue-Langevin, CS 20156, 38042 Grenoble Cedex 9, France.
  8. Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.
  9. Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
  10. RISE Acreo AB, SE-411 33 Göteborg, Sweden.
  11. Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia.

PMID: 29694199 DOI: 10.1103/PhysRevLett.120.137201

Abstract

Excitations in a spin ice behave as magnetic monopoles, and their population and mobility control the dynamics of a spin ice at low temperature. CdEr_{2}Se_{4} is reported to have the Pauling entropy characteristic of a spin ice, but its dynamics are three orders of magnitude faster than the canonical spin ice Dy_{2}Ti_{2}O_{7}. In this Letter we use diffuse neutron scattering to show that both CdEr_{2}Se_{4} and CdEr_{2}S_{4} support a dipolar spin ice state-the host phase for a Coulomb gas of emergent magnetic monopoles. These Coulomb gases have similar parameters to those in Dy_{2}Ti_{2}O_{7}, i.e., dilute and uncorrelated, and so cannot provide three orders faster dynamics through a larger monopole population alone. We investigate the monopole dynamics using ac susceptometry and neutron spin echo spectroscopy, and verify the crystal electric field Hamiltonian of the Er^{3+} ions using inelastic neutron scattering. A quantitative calculation of the monopole hopping rate using our Coulomb gas and crystal electric field parameters shows that the fast dynamics in CdEr_{2}X_{4} (X=Se, S) are primarily due to much faster monopole hopping. Our work suggests that CdEr_{2}X_{4} offer the possibility to study alternative spin ice ground states and dynamics, with equilibration possible at much lower temperatures than the rare earth pyrochlore examples.

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