Exotic Magnetism on the Quasi-fcc Lattices of the ${d}^{3}$ Double Perovskites ${\mathrm{La}}_{2}\mathrm{Na}{B}^{\ensuremath{'}}{\mathrm{O}}_{6}$ (${B}^{\ensuremath{'}}=\mathrm{Ru}$, Os)

Exotic Magnetism on the Quasi-fcc Lattices of the $d^{3}$ Double Perovskites ${La}_{2} Na B^{'} O_{6}$ ( $B^{'} = Ru$ , Os)

A. A. Aczel, P. J. Baker, D. E. Bugaris, J. Yeon, H.-C. zur Loye, T. Guidi, and D. T. Adroja

Phys. Rev. Lett. 112, 117603 – Published 20 March 2014

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 ${La}_{2} {NaRuO}_{6}$ and ${La}_{2} {NaOsO}_{6}$ , 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 $Δ \sim 2.75 meV$ . Magnetic anisotropy is generally minimized in the more familiar octahedrally coordinated $3 d^{3}$ systems, so the large gap observed for ${La}_{2} {NaRuO}_{6}$ may result from the significantly enhanced value of spin-orbit coupling in this $4 d^{3}$ material.

Received 7 January 2014

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

Authors & Affiliations

A. A. Aczel^1,*, P. J. Baker², D. E. Bugaris³, J. Yeon³, H.-C. zur Loye³, T. Guidi², and D. T. Adroja^2,4

¹Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
²ISIS Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Oxfordshire OX11 0QX, United Kingdom
³Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA
⁴Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa

^*Corresponding author. aczelaa@ornl.gov

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Vol. 112, Iss. 11 — 21 March 2014

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Physical Review Letters

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

A. A. Aczel, P. J. Baker, D. E. Bugaris, J. Yeon, H.-C. zur Loye, T. Guidi, and D. T. Adroja

Phys. Rev. Lett. 112, 117603 – Published 20 March 2014

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Exotic Magnetism on the Quasi-fcc Lattices of the $d^{3}$ Double Perovskites ${La}_{2} Na B^{'} O_{6}$ ( $B^{'} = Ru$ , Os)