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

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

    By Mark | Publications | Comments are Closed | 15 February, 2016 | 0

    Mark S. Senn, Simon A. J. Kimber, Angel M. Arevalo Lopez, Adrian H. Hill, and J. Paul Attfield, Physical Review B 87 (13), 134402

    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 13-magnetization steps in the magnetic hysteresis loop.

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    Mark

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