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Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique

TT 16.69: Poster

Saturday, March 5, 2005, 11:00–16:30, Poster TU C

Magnetic Ordering in Trigonal Chain Compounds — •Christian Laschinger1, Udo Schwingenschlögl1, Volker Eyert1, Thilo Kopp1, Raymond Frésard2, and Ulrich Eckern11University of Augsburg — 2Institut des Sciences de la Matière et du Rayonnement, Caen, France

We investigate the microscopic origin of the ferromagnetic and antiferromagnetic spin exchange couplings in the quasi-one-dimensional cobalt compounds Ca3ABO6 with A = Fe, Co and B = Co, Rh. From electronic structure calculations we find A 3d low spin and high spin states alternating along the characteristic chains. In addition strong d-p hybridisation leads to the formation of extended localized magnetic moments centered at the high spin sites. Antiferromagnetic coupling along the chains is induced by a strong metal-metal overlap via the d3z2r2 orbitals of the low spin sites. It competes with ferromagnetic exchange, which originates in a cyclic exchange through the ligand atoms.

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