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Title: Crystal fields and magnetic structure of the Ising antiferromagnet Er3Ga5O12

Journal Article · · Physical Review B
ORCiD logo [1];  [1];  [1];  [1];  [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [4];  [1]; ORCiD logo [5];  [6]
  1. McMaster Univ., Hamilton, ON (Canada)
  2. Colorado State Univ., Fort Collins, CO (United States). Physics Dept.
  3. Colorado State Univ., Fort Collins, CO (United States). Physics Dept.; Canadian Inst. for Advanced Research, Toronto, Ontario, Canada
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
  6. McMaster Univ., Hamilton, ON (Canada); Canadian Inst. for Advanced Research, Toronto, ON (Canada); TRIUMF, Vancouver, BC (Canada)

Rare-earth garnets are an exciting playground for studying the exotic magnetic properties of the frustrated hyperkagome lattice. In this paper we present a comprehensive study of the single ion and collective magnetic properties of the garnet Er 3 Ga 5 O 12 . Using inelastic neutron scattering, we find a crystal-field ground-state doublet for Er 3 + with strong Ising anisotropy along local [100] axes. Magnetic susceptibility and heat-capacity measurements provide evidence for long-range magnetic ordering with T N = 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 ( Γ 3 ) common to many of the rare-earth garnets. However, we also found that μ SR 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 Er 3 Ga 5 O 12 is an excellent model system for studying the complex metamagnetism expected for a multiaxis antiferromagnet.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS) and High Flux Isotope Reactor (HFIR)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Natural Sciences and Engineering Research Council of Canada (NSERC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1607071
Journal Information:
Physical Review B, Vol. 100, Issue 18; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 9 works
Citation information provided by
Web of Science

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