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; D. T. Adroja

doi:10.1103/PhysRevLett.112.117603

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, D. T. Adroja

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Abstract

We find evidence for long-range and short-range (ζ=70Å 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∼2.75meV. 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.

Original language	English
Article number	117603
Journal	Physical Review Letters
Volume	112
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevLett.112.117603
State	Published - Mar 20 2014

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title = "Exotic magnetism on the Quasi-fcc lattices of the d3 double perovskites La2NaB′ O6 (B′=Ru, Os)",

abstract = "We find evidence for long-range and short-range (ζ=70{\AA} 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∼2.75meV. 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.",

author = "Aczel, {A. A.} and Baker, {P. J.} and Bugaris, {D. E.} and J. Yeon and {Zur Loye}, {H. C.} and T. Guidi and Adroja, {D. T.}",

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T1 - Exotic magnetism on the Quasi-fcc lattices of the d3 double perovskites La2NaB′ O6 (B′=Ru, Os)

AU - Aczel, A. A.

AU - Baker, P. J.

AU - Bugaris, D. E.

AU - Yeon, J.

AU - Zur Loye, H. C.

AU - Guidi, T.

AU - Adroja, D. T.

PY - 2014/3/20

Y1 - 2014/3/20

N2 - We find evidence for long-range and short-range (ζ=70Å 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∼2.75meV. 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.

AB - We find evidence for long-range and short-range (ζ=70Å 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∼2.75meV. 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.

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Exotic magnetism on the Quasi-fcc lattices of the d3 double perovskites La2NaB′ O6 (B′=Ru, Os)

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