Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr2X4 (X = Se, S)

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, Emmanuel Canevet, M. Medarde, J. Blomgren, C. Johansson, S. R. Giblin, S. Vrtnik, J. Luzar, A. Loidl & 2 others Ch. Ruegg, T. Fennell

*Corresponding author for this work

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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. CdEr2X4 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 Dy2Ti2O7. In this Letter we use diffuse neutron scattering to show that both CdEr2X4 and CdEr2X4 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 Dy2Ti2O7, 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 Er3+ 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 CdEr2X4 (X = Se, S) are primarily due to much faster monopole hopping. Our work suggests that CdEr2X4 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.
Original languageEnglish
Article number137201
JournalPhysical Review Letters
Volume120
Issue number13
Number of pages6
ISSN0031-9007
DOIs
Publication statusPublished - 2018

Cite this

Gao, S., Zaharko, O., Tsurkan, V., Prodan, L., Riordan, E., Lago, J., ... Fennell, T. (2018). Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr2X4 (X = Se, S). Physical Review Letters, 120(13), [137201]. https://doi.org/10.1103/PhysRevLett.120.137201
Gao, Shang ; Zaharko, O. ; Tsurkan, V. ; Prodan, L. ; Riordan, E. ; Lago, J. ; Fåk, B. ; Wildes, A. R. ; Koza, M. M. ; Ritter, C. ; Fouquet, P. ; Keller, L. ; Canevet, Emmanuel ; Medarde, M. ; Blomgren, J. ; Johansson, C. ; Giblin, S. R. ; Vrtnik, S. ; Luzar, J. ; Loidl, A. ; Ruegg, Ch. ; Fennell, T. / Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr2X4 (X = Se, S). In: Physical Review Letters. 2018 ; Vol. 120, No. 13.
@article{df29194d0b064d66b1ad12fcbf9b20fc,
title = "Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr2X4 (X = Se, S)",
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. CdEr2X4 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 Dy2Ti2O7. In this Letter we use diffuse neutron scattering to show that both CdEr2X4 and CdEr2X4 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 Dy2Ti2O7, 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 Er3+ 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 CdEr2X4 (X = Se, S) are primarily due to much faster monopole hopping. Our work suggests that CdEr2X4 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.",
author = "Shang Gao and O. Zaharko and V. Tsurkan and L. Prodan and E. Riordan and J. Lago and B. F{\aa}k and Wildes, {A. R.} and Koza, {M. M.} and C. Ritter and P. Fouquet and L. Keller and Emmanuel Canevet and M. Medarde and J. Blomgren and C. Johansson and Giblin, {S. R.} and S. Vrtnik and J. Luzar and A. Loidl and Ch. Ruegg and T. Fennell",
year = "2018",
doi = "10.1103/PhysRevLett.120.137201",
language = "English",
volume = "120",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "13",

}

Gao, S, Zaharko, O, Tsurkan, V, Prodan, L, Riordan, E, Lago, J, Fåk, B, Wildes, AR, Koza, MM, Ritter, C, Fouquet, P, Keller, L, Canevet, E, Medarde, M, Blomgren, J, Johansson, C, Giblin, SR, Vrtnik, S, Luzar, J, Loidl, A, Ruegg, C & Fennell, T 2018, 'Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr2X4 (X = Se, S)', Physical Review Letters, vol. 120, no. 13, 137201. https://doi.org/10.1103/PhysRevLett.120.137201

Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr2X4 (X = Se, S). / Gao, Shang; Zaharko, O.; Tsurkan, V.; Prodan, L.; Riordan, E.; Lago, J.; Fåk, B.; Wildes, A. R.; Koza, M. M.; Ritter, C.; Fouquet, P.; Keller, L.; Canevet, Emmanuel; Medarde, M.; Blomgren, J.; Johansson, C.; Giblin, S. R.; Vrtnik, S.; Luzar, J.; Loidl, A.; Ruegg, Ch.; Fennell, T.

In: Physical Review Letters, Vol. 120, No. 13, 137201, 2018.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Dipolar Spin Ice States with a Fast Monopole Hopping Rate in CdEr2X4 (X = Se, S)

AU - Gao, Shang

AU - Zaharko, O.

AU - Tsurkan, V.

AU - Prodan, L.

AU - Riordan, E.

AU - Lago, J.

AU - Fåk, B.

AU - Wildes, A. R.

AU - Koza, M. M.

AU - Ritter, C.

AU - Fouquet, P.

AU - Keller, L.

AU - Canevet, Emmanuel

AU - Medarde, M.

AU - Blomgren, J.

AU - Johansson, C.

AU - Giblin, S. R.

AU - Vrtnik, S.

AU - Luzar, J.

AU - Loidl, A.

AU - Ruegg, Ch.

AU - Fennell, T.

PY - 2018

Y1 - 2018

N2 - Excitations in a spin ice behave as magnetic monopoles, and their population and mobility control the dynamics of a spin ice at low temperature. CdEr2X4 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 Dy2Ti2O7. In this Letter we use diffuse neutron scattering to show that both CdEr2X4 and CdEr2X4 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 Dy2Ti2O7, 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 Er3+ 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 CdEr2X4 (X = Se, S) are primarily due to much faster monopole hopping. Our work suggests that CdEr2X4 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.

AB - Excitations in a spin ice behave as magnetic monopoles, and their population and mobility control the dynamics of a spin ice at low temperature. CdEr2X4 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 Dy2Ti2O7. In this Letter we use diffuse neutron scattering to show that both CdEr2X4 and CdEr2X4 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 Dy2Ti2O7, 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 Er3+ 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 CdEr2X4 (X = Se, S) are primarily due to much faster monopole hopping. Our work suggests that CdEr2X4 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.

U2 - 10.1103/PhysRevLett.120.137201

DO - 10.1103/PhysRevLett.120.137201

M3 - Journal article

VL - 120

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 13

M1 - 137201

ER -