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, J. Paul Attfield

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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 Ba3NdRu2O9 is attributed to Jahn-Teller distortion, evidenced by large-amplitude Γ6 deformations of the NdO6 octahedra. Further lattice anomalies accompany magnetic ordering transitions at 24 and 18 K in Ba3NdRu2O9. Nd spins order ferromagnetically and a substantial magnetic anisotropy leads to large coercivity and 1/3-magnetization steps in the magnetic hysteresis loop.

Original languageEnglish
Article number134402
JournalPhysical Review B
Volume87
Issue number13
Early online date2 Apr 2013
DOIs
Publication statusPublished - 2013

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