Orbital Ordering and Spin-Ladder Formation in La2RuO5

Abstract

The semiconductor-semiconductor transition of La2RuO5 is studied by means of augmented spherical wave (ASW) electronic structure calculations as based on density functional theory and the local density approximation. This transition has lately been reported to lead to orbital ordering and a quenching of the local spin magnetic moment. Our results hint towards an orbital ordering scenario which, markedly different from the previously proposed scheme, preserves the local S = 1 moment at the Ru sites in the low-temperature phase. The unusual magnetic behaviour is interpreted by the formation of spin-ladders, which result from the structural changes occurring at the transition and are characterized by antiferromagnetic coupling along the rungs.

5 pages, 4 figures, for more information see http://www.physik.uni-augsburg.de/~eyert/

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• Orbitally-driven Peierls state in spinels
• Nature of magnetism in Ca${}_3$Co${}_2$O${}_6$
• The Origin of Magnetic Interactions in Ca3Co2O6
• Charge order, orbital order, and electron localization in the Magneli phase Ti4O7
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Cited by in corpus (6)

• New Type Phase Transition of Li2RuO3 with Honeycomb Structure
• Orbitally driven spin-singlet dimerization in $S$=1 La${}_4$Ru${}_2$O${}_{10}$
• Structural Transition of Li2RuO3 Induced by Molecular-Orbit Formation
• Antiferromagnetic order and consequences on the transport properties of Ba${}_4$Ru${}_3$O${}_{10}$
• Orbital ordering in the ferromagnetic insulator Cs${}_2$AgF${}_4$ from first principles
• Optical study of MgTi${}_2$O${}_4$: Evidence for an orbital-Peierls state