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Unraveling the magnetic ground state in the alkali-metal lanthanide oxide Na2⁢Pr⁡O3

Journal Article · · Physical Review. B
 [1];  [2];  [3];  [2];  [1];  [4];  [5];  [6];  [3];  [2];  [3]
  1. Univ. of Parma (Italy)
  2. Univ. of Bologna (Italy)
  3. Brown Univ., Providence, RI (United States)
  4. Univ. of Windsor, ON (Canada)
  5. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
  6. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
+ Show Author Affiliations
Here, a comprehensive set of muon spin spectroscopy and neutron scattering measurements supported by ab initio and model Hamiltonian simulations have been used to investigate the magnetic ground state of Na2⁢PrO3. μSR reveals a Néel antiferromagnetic order below TN ~ 4.9K, with a small static magnetic moment mstatic ≤ 0.22 μB/Pr collinearly aligned along the c axis. Inelastic neutron measurements reveal the full spectrum of crystal field excitations and confirm that the Pr4+ ground-state wave function deviates significantly from the Γ7 limit that is relevant to the Kitaev model. Single- and two-magnon excitations are observed in the ordered state below TN=4.6K and are well described by nonlinear spin wave theory from the Néel state using a magnetic Hamiltonian with Heisenberg exchange J=1 meV and symmetric anisotropic exchange Γ/J=0.1, corresponding to an XY model. Intense two magnon excitations are accounted for by g-factor anisotropy gz/g± = 1.29. A fluctuating moment δm2 = 0.57 ⁢(22) ⁢μ$$^2_B$$/Pr extracted from the energy and momentum integrated inelastic neutron signal is reduced from expectations for a local J = 1/2 moment with average g factor gavg ≈ 1.1. Together, the results demonstrate that the small moment in Na2⁢PrO3 arises from crystal field and covalency effects and the material does not exhibit significant quantum fluctuations.
Research Organization:
Brown University, Providence, RI (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725; SC0021223
OSTI ID:
2438739
Alternate ID(s):
OSTI ID: 2474291
OSTI ID: 2564654
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 6 Vol. 110; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
Kitaev model
crystal field excitations
inelastic neutron scattering
magnetism
magnons
muon spin relaxation & rotation
neutron diffraction
neutron scattering