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SUMMARY:Magnetic Structure Solution of Frustrated Spin Systems - Joe Paddi
 son\, University of Oxford and STFC-ISIS Facility\, UK.
DTSTART:20150527T101500Z
DTEND:20150527T111500Z
UID:TALK59451@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:In frustrated magnetic materials\, geometry and magnetic inter
 actions combine to suppress conventional magnetic order. Instead\, disorde
 red "spin liquid" states can host exotic magnetic phenomena which persist 
 to the lowest measurable temperatures. Neutron scattering is an ideal expe
 rimental technique to understand spin-liquid states\, but the absence of c
 onventional magnetic order means that standard data-analysis methods canno
 t be used. Two limitations have traditionally restricted our understanding
  spin liquids at the atomic scale: (i) the magnetic interactions must be a
 nticipated\, and (ii) single-crystal samples must be available.\n\nIn my p
 resentation\, I will show how neutron-scattering data can be converted rob
 ustly into a three-dimensional model of the spin-liquid state. Using an at
 omistic refinement approach\, I show that it is possible to recover accura
 te three-dimensional information from powder-averaged data\, without makin
 g any assumptions about the underlying magnetic interactions. I will prese
 nt experimental results for two materials. First\, I present evidence for 
 a "hidden order" state in the canonical frustrated magnet Gd3Ga5O12. Secon
 d\, I use single-crystal neutron-scattering data to understand the origin 
 of magnetic disorder in beta-Mn and its alloys. Finally\, I will discuss t
 he implications of these results for understanding disorder in other mater
 ials.\n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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