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Octupolar versus Néel Order in Cubic 5d^{2} Double Perovskites.

D D Maharaj1, G Sala1,2, M B Stone2

  • 1Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1, Canada.

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|March 14, 2020
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Summary
This summary is machine-generated.

We studied double perovskite magnets Ba_{2}MOsO_{6} (M=Zn,Mg,Ca) using neutron and X-ray diffraction. Despite evidence of magnetic order, no magnetic Bragg scattering was observed, suggesting exotic ferro-octupolar order.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • 5d double perovskites are promising for exotic magnetic orders.
  • Osmium (Os) based compounds offer unique electronic configurations.
  • Understanding symmetry breaking in magnetic materials is crucial.

Purpose of the Study:

  • Investigate the magnetic properties of Ba_{2}MOsO_{6} (M=Zn,Mg,Ca).
  • Determine the nature of magnetic order and symmetry breaking.
  • Explore potential exotic orders driven by multipolar interactions.

Main Methods:

  • Time-of-flight neutron spectroscopy.
  • Neutron and X-ray diffraction.
  • Muon spin resonance experiments.

Main Results:

  • Materials remain cubic with antiferromagnetically coupled Os^{6+} ions.
  • A single phase transition at T* was observed with a gapped magnetic excitation spectrum.
  • Muon spin resonance indicated time-reversal symmetry breaking, but no magnetic Bragg scattering was detected.

Conclusions:

  • The results are consistent with ferro-octupolar symmetry breaking below T*.
  • This suggests exotic magnetic orders beyond conventional antiferromagnetism.
  • Further research into multipolar interactions in 5d double perovskites is warranted.