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SUMMARY:Spin-resolved momentum densities:  What we can learn from magnetic
  Compton scattering.  - Jonathan Duffy\, University of Warwick
DTSTART:20130220T111500Z
DTEND:20130220T121500Z
UID:TALK41147@talks.cam.ac.uk
CONTACT:Michael Sutherland
DESCRIPTION:Studies of spin-resolved electron momentum densities involve t
 he measurement of the so-called magnetic Compton profile. This is a one-di
 mensional projection of the electron momentum distribution of only those e
 lectrons that contribute to the spin moment of a sample.  The technique is
  applicable to ferri- and ferromagnetic materials.  The profile is obtaine
 d via the inelastic “Compton” scattering of high energy X-rays typical
 ly using the ESRF and SPring-8 synchrotron X-ray sources.\n\nSince electro
 ns originating from different atomic orbitals have specific momentum densi
 ties\, it is often possible to determine the origin of the magnetism prese
 nt.  Typically\, interpretation requires the use of electronic structure c
 alculations using molecular orbital and band structure approaches.  By usi
 ng both theoretical methods in combination\, a considerable amount of info
 rmation can be obtained from the experimental profiles.  The value of this
  approach will be demonstrated with some examples of our recent research\,
  including studies of the magnetic ground states in the frustrated spin-ch
 ain compound Ca3Co2O6\, in non-stoichiometric NbFe2 and in the ferromagnet
 ic superconductor UCoGe\, as well as the determination of the Fermi level 
 spin polarisation in spin-polarised materials.  \n
LOCATION:TCM Seminar Room\, Cavendish Laboratory\, Department of Physics
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