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Lecture Simon A.J. Kimber


07 December 2010 FWN-Building 5118.-152, Nijenborgh 4, 9747 AG, Groningen
Speaker: Dr. Simon A.J. Kimber
Affiliation: ESRF, Grenoble, France
Title: Fractional excitations and frustration in spin systems
Date: Tue Dec 7, 2010
Start: 11.00
Location: FWN-Building 5118.-152
Host: T.T.M. Palstra
Telephone: +31 50 363 4419


Transition metal oxides make up a large and technologically useful class of materials. In this seminar I shall describe how complex behaviour emerges in these materials as a result of local degrees of freedom and long-range interactions. Neutron and X-ray scattering are an ideal probe of the spatial and temporal correlations in these cases, and I will describe two new systems which show counterintuitive behaviour. The first, CoV2O6, is an effective S=1/2 spin chain with fractional excitations, which are confined at low temperatures. The second, Ba3NaRu2O9, is a rare example of a frustrated lattice which shows near integer order of charges, and unusual freezing and melting dynamics.

Last modified:22 October 2012 2.31 p.m.