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Crystal fields and magnetic structure of the Ising antiferromagnet Er3Ga5O12

Y. Cai, M. N. Wilson, J. Beare, C. Lygouras, G. Thomas, D. R. Yahne, K. Ross, K. M. Taddei, G. Sala, H. A. Dabkowska, A. A. Aczel, and G. M. Luke
Phys. Rev. B 100, 184415 – Published 18 November 2019

Abstract

Rare-earth garnets are an exciting playground for studying the exotic magnetic properties of the frustrated hyperkagome lattice. Here we present a comprehensive study of the single ion and collective magnetic properties of the garnet Er3Ga5O12. Using inelastic neutron scattering, we find a crystal-field ground-state doublet for Er3+ with strong Ising anisotropy along local [100] axes. Magnetic susceptibility and heat-capacity measurements provide evidence for long-range magnetic ordering with TN=0.8 K, and no evidence for residual entropy is found when cooling through the ordering transition. Neutron powder diffraction reveals that the ground-state spin configuration corresponds to the six-sublattice, Ising antiferromagnetic state (Γ3) common to many of the rare-earth garnets. However, we also found that μSR appears to be insensitive to the ordering transition in this material, in which a low-temperature relaxation plateau was observed with no evidence of spontaneous muon precession. The combined muon and neutron results may be indicative of a dynamical ground state with a relatively long correlation time. Despite this potential complication, our work indicates that Er3Ga5O12 is an excellent model system for studying the complex metamagnetism expected for a multiaxis antiferromagnet.

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  • Received 9 May 2019

DOI:https://doi.org/10.1103/PhysRevB.100.184415

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Y. Cai1, M. N. Wilson1, J. Beare1, C. Lygouras1, G. Thomas1, D. R. Yahne2, K. Ross2,3, K. M. Taddei4, G. Sala4, H. A. Dabkowska5, A. A. Aczel4,6,*, and G. M. Luke1,3,7,†

  • 1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1
  • 2Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA
  • 3Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1M1
  • 4Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 5Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1
  • 6Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 7TRIUMF, Vancouver, British Columbia, Canada V6T 2A3

  • *aczelaa@ornl.gov
  • luke@mcmaster.ca

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Issue

Vol. 100, Iss. 18 — 1 November 2019

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