Exotic Magnetism on the Quasi-FCC Lattices of the d³ Double Perovskites La₂NaB′O₆ (B′ = Ru, Os)

Author(s)

A. A. Aczel, Oak Ridge National Laboratory, Oak Ridge, TennesseeFollow
P. J. Baker, STFC Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire, United Kingdom
Daniel E. Bugaris, University of South Carolina - ColumbiaFollow
Jeongho Yeon, University of South Carolina - Columbia
Hans-Conrad zur Loye, University of South Carolina - ColumbiaFollow
T. Guidi, STFC Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire, United Kingdom
D. T. Adroja, University of Johannesburg

Document Type

Article

Subject Area(s)

Chemistry

Abstract

We find evidence for long-range and short-range (ζ=70 Å at 4 K) incommensurate magnetic order on the quasi-face-centered-cubic (fcc) lattices of the monoclinic double perovskites La₂NaRuO₆ and La₂NaOsO₆, respectively. Incommensurate magnetic order on the fcc lattice has not been predicted by mean field theory, but may arise via a delicate balance of inequivalent nearest neighbor and next nearest neighbor exchange interactions. In the Ru system with long-range order, inelastic neutron scattering also reveals a spin gap Δ∼2.75 meV. Magnetic anisotropy is generally minimized in the more familiar octahedrally coordinated 3d³ systems, so the large gap observed for La₂NaRuO₆ may result from the significantly enhanced value of spin-orbit coupling in this 4d³ material.

Digital Object Identifier (DOI)

https://doi.org/10.1103/PhysRevLett.112.117603

Publication Info

Published in Physical Review Letters, Volume 112, Issue 11, 2014, pages 117603-.

Rights

© Physical Review Letters 2014, American Physical Society.

APA Citation

Aczel, A., Baker, P., Bugaris, D., Yeon, J., zur Loye, H.-C., Guidi, T., & Adroja, D. (2014). Exotic Magnetism on the Quasi-FCC Lattices of the d³ Double Perovskites La₂NaB′O₆ (B′ = Ru, Os). Physical Review Letters, 112(11), 117603. https://doi.org/10.1103/PhysRevLett.112.117603