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Lecture Maurits Haverkort


04 February 2009 FWN-Building 5116.0116, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Maurits Haverkort
Affiliation: Max Planck Institute, Stuttgart, Germany
Title: Orbital and Spin excitations in Cobaltates and Titanates studied with model calculations and x-ray spectroscopies
Date: Wed Feb 4, 2009
Start: 16.00
Location: FWN-Building 5116.0116
Host: Maxim Mostovoy
Telephone: +31 50 363 3419


Both in the Cobaltates (d6 or d7) and in the Titanates (d1) one can find
transition metal ions in nearly cubic symmetry with an open t2g shell. The degeneracy of the t2g orbitals is lifted by relativistic spin-orbit coupling, spin-spin, orbital-orbital, spin-orbital and orbital-lattice interactions. This leads to low energy excitations that show an extremely rich physics. We have studied these systems with full multiplet cluster calculations based on Wannier functions obtained from down folded LDA band-structure calculations. The results are compared to several x-ray spectroscopy measurements. We discuss the accuracy one can obtain by the calculation of the static crystal- field distortions in the Titanates, and the presence of orbital momentum in the Cobaltates.

Last modified:22 October 2012 2.30 p.m.