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SUMMARY:Spin and Orbital Order in the vanadium spinels - Elisa Wheeler\,  
 Institut Laue-Langevin\, Grenoble\, France
DTSTART:20150325T111500Z
DTEND:20150325T121500Z
UID:TALK58574@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:The Vanadium spinels AV2O4\, where A is a diamagnetic ion\, pr
 ovide ideal systems to study the interactions between spin\, lattice and o
 rbital degrees of freedom. The magnetic V3+ ions are antiferromagnetically
  coupled and sit at vertices of a network of corner sharing tetrahedra lea
 ding to three-dimensional geometrical frustration. The magnetic V3+ (S=1) 
 has two electrons occupying the triply degenerate 3d-shell t2g orbitals. T
 his degeneracy is only partially lifted by a tetragonal distortion at low 
 temperatures and an orbital degree of freedom remains. ZnV2O4 is the most 
 widely studied member of this class of compounds. Yet single crystal sampl
 es\, currently not available\, are needed to investigate details to distin
 guish between the variety of orbital ordering models predicted. I will pre
 sent a study on large single crystal samples of MgV2O4 investigating the c
 rystal and magnetic structure down to low temperatures. I will also presen
 t initial inelastic neutron scattering results and discuss the relevance t
 o the orbital order and the magnetic models to which they approximate.
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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