Long and short range magnetism in the frustrated double perovskite Ba2MnWO6

Heather Mutch; Otto Mustonen; Helen C. Walker; Peter J. Baker; Gavin B. G. Stenning; Fiona C. Coomer; Edmund J. Cussen

doi:10.1103/PhysRevMaterials.4.014408

Long and short range magnetism in the frustrated double perovskite Ba2MnWO6

Materials Science 2020-02-05 v1 Strongly Correlated Electrons

Authors: Heather Mutch , Otto Mustonen , Helen C. Walker , Peter J. Baker , Gavin B. G. Stenning , Fiona C. Coomer , Edmund J. Cussen

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Abstract

The structural and magnetic properties of the face-centered cubic double perovskite Ba2MnWO6 were investigated using neutron powder diffraction, DC-magnetometry, muon spin relaxation and inelastic neutron scattering. Ba2MnWO6 undergoes Type II long-range antiferromagnetic ordering at a Neel temperature of 8(1) K with a frustration index, f = 8. Inelastic neutron scattering was used to identify the magnetic coupling constants J1 and J2, which were found to equal -0.080 meV and -0.076 meV respectively. This indicated that both of the magnetic coupling constants were antiferromagnetic with similar magnitudes, which is in contrast to other known 3d metal double perovskites Ba2MWO6. Above the Neel temperature, muon spin relaxation measurements and inelastic neutron scattering techniques identify a short-range correlated magnetic state that is similar to that observed in the archetypical face-centered cubic lattice antiferromagnet MnO.

Keywords

double perovskite antiferromagnetic ordering frustration muon spin relaxation inelastic neutron scattering short-range magnetism

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@article{arxiv.1910.03963,
  title  = {Long and short range magnetism in the frustrated double perovskite Ba2MnWO6},
  author = {Heather Mutch and Otto Mustonen and Helen C. Walker and Peter J. Baker and Gavin B. G. Stenning and Fiona C. Coomer and Edmund J. Cussen},
  journal= {arXiv preprint arXiv:1910.03963},
  year   = {2020}
}

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19 pages, 5 figures

Long and short range magnetism in the frustrated double perovskite Ba2MnWO6

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