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TT: Tiefe Temperaturen

TT 11: Fachsymposium: Eindimensionale Übergangsmetalle

TT 11.5: Hauptvortrag

Dienstag, 27. März 2001, 16:30–17:00, A

Properties of new one-dimensional transition metal oxides — •Frédéric Mila — Institut de Physique Théorique, Université de Lausanne (Switzerland)

In this talk, I will review the current theoretical understanding of a number of quasi-one dimensional transition metal oxides with remarkable properties which have been recently synthetized. The emphasis will be put on three systems, with very different properties:

1) LiVGe₂O₆, a spin 1 system which orders at relatively high temperature despite very well separated chains, and for which the presence of a biquadratic interaction has been proposed.

2) VOSb₂O₄, the first inorganic spin 1/2 chain which exhibits a pseudo-gap behaviour before undergoing what is presumably a spin-Peierls transition.

3) Cu₂Te₂O₅X₂ (X=cl,Br), a quasi-one dimensional arrangement of Cu²⁺ tetrahedra which is expected to have low-lying singlet excitations inside a large singlet-triplet gap.