Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba${}_{3}{B}^{\ensuremath{'}}$Ru${}_{2}$O${}_{9}$ (${B}^{\ensuremath{'}}$ = La${}^{3+}$, Nd${}^{3+}$, and Y${}^{3+}$)

Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba $_{3} B^{'}$ Ru $_{2}$ O $_{9}$ ( $B^{'}$ = La $^{3 +}$ , Nd $^{3 +}$ , and Y $^{3 +}$ )

Mark S. Senn, Simon A. J. Kimber, Angel M. Arevalo Lopez, Adrian H. Hill, and J. Paul Attfield

Phys. Rev. B 87, 134402 – Published 2 April 2013

Abstract

The magnetic and crystal structures of the title materials have been investigated using high-resolution neutron and synchrotron x-ray powder diffraction. Ferromagnetic Ru dimers are observed in the spin-ordered ground states of all three materials, evidencing an intradimer double exchange interaction. Antiferromagnetic order between dimers breaks the degeneracy of the triangular lattice but no distortion of the $B^{'} = La$ and Y structures is observed. The magnetic ordering transition temperature increases with the radius of the $B^{'}$ cation. An anomalous 120 K structural transition in Ba $_{3}$ NdRu $_{2}$ O $_{9}$ is attributed to Jahn-Teller distortion, evidenced by large-amplitude $Γ_{6}$ deformations of the NdO $_{6}$ octahedra. Further lattice anomalies accompany magnetic ordering transitions at 24 and 18 K in Ba $_{3}$ NdRu $_{2}$ O $_{9}$ . Nd spins order ferromagnetically and a substantial magnetic anisotropy leads to large coercivity and $\frac{1}{3}$ -magnetization steps in the magnetic hysteresis loop.

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Received 25 January 2013

DOI:https://doi.org/10.1103/PhysRevB.87.134402

Authors & Affiliations

Mark S. Senn¹, Simon A. J. Kimber², Angel M. Arevalo Lopez¹, Adrian H. Hill^2,*, and J. Paul Attfield^1,†

¹Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, United Kingdom
²ESRF, Boîte Postale 156, F-38042 Grenoble Cedex 9, France

^*Current address: Johnson Matthey Technology Centre, Savannah, GA, USA.
^†j.p.attfield@ed.ac.uk

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Vol. 87, Iss. 13 — 1 April 2013

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Physical Review B

covering condensed matter and materials physics

Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba $_{3} B^{'}$ Ru $_{2}$ O $_{9}$ ( $B^{'}$ = La $^{3 +}$ , Nd $^{3 +}$ , and Y $^{3 +}$ )

Mark S. Senn, Simon A. J. Kimber, Angel M. Arevalo Lopez, Adrian H. Hill, and J. Paul Attfield

Phys. Rev. B 87, 134402 – Published 2 April 2013

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Physical Review B

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Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba3B′Ru2O9 (B′ = La3+, Nd3+, and Y3+)

Mark S. Senn, Simon A. J. Kimber, Angel M. Arevalo Lopez, Adrian H. Hill, and J. Paul Attfield

Phys. Rev. B 87, 134402 – Published 2 April 2013

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Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba $_{3} B^{'}$ Ru $_{2}$ O $_{9}$ ( $B^{'}$ = La $^{3 +}$ , Nd $^{3 +}$ , and Y $^{3 +}$ )