Session X18: Focus Session: Low D/Frustrated Magnetism - Spin Chains & Ladders
2:30 PM–5:30 PM, Thursday, March 24, 2011
Room: D172
Sponsoring Units:
GMAG DMP
Chair: Marcelo Jamie, Los Alamos National Laboratory
Abstract ID: BAPS.2011.MAR.X18.8
Abstract: X18.00008 : The origin of the incommesurate phase in the spin Peierls compound TiOCl
4:18 PM–4:30 PM
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Abstract 
Authors:
Ariel Dobry
(Instituto de F\'isica de Rosario)
Diego Mastrogiuseppe
(Instituto de F\'isica de Rosario)
Claudio Gazza
(Instituto de F\'isica de Rosario)
TiOX (X=Cl,Br) are recently characterized Spin-Peierls compounds. They are unusual due to the appearance of an intermediate incommensurate phase between the dimerized and the uniform ones. We show that the incommensurate phase is stabilized by a linear dependency of the phononic dispersion near the dimerized mode. A model based on antiferromagnetic chains with position dependent exchanges accounts for the evolution of the atomic coordinates with temperature within the incommensurate phase. The magnetic gap closes in the intermediate phase. Finally, we find that the magnetic static structure factor has incommensurate peaks situated at twice the wave vector of the structural ones. These peaks could be found in future elastic neutron scattering measurements.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.X18.8