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SUMMARY:Multiferroic hexagonal RMnO3: a model system for 2D triangular lat
 tice antiferromagnets - Prof. Je-Geun Park. 1-Center for Correlated Electr
 on Systems\, Institute for Basic Science (IBS)\, Seoul. 2-Department of Ph
 ysics and Astronomy\, Seoul National University\, Seoul 
DTSTART:20160119T150000Z
DTEND:20160119T160000Z
UID:TALK63951@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:Two-dimensional triangular lattice has been the source of rich
  physics with its generic frustration effects. We have investigated the sp
 in-lattice coupling and magnetism of the two-dimensional triangular lattic
 e in hexagonal RMnO3. Hexagonal RMnO3 belongs to a class of multiferroic m
 aterials with both ferroelectric and antiferromagnetic transitions in a si
 ngle compound. One of salient features of RMnO3 is that Mn ions form a nat
 ural 2D triangular lattice with a noncollinear 120 structure.\nIn this 
 talk\, I will present our works conducted over the past few years\, where 
 we have addressed mainly two issues: (i) the origin of magnetoelectric cou
 pling and (ii) the spin waves. First\, by using high-resolution neutron an
 d synchrotron diffraction studies we demonstrated that a strong spin-latti
 ce coupling lies at the heart of the magnetoelectric coupling in these com
 pounds. Second\, I will discuss how the spin waves measured by inelastic n
 eutron scattering techniques allowed us to not only confirm the existence 
 of a strong spin-lattice coupling but also unravel unusual nonlinear magno
 n interaction effects in these materials somewhat unexpectedly.\n
LOCATION:TCM Seminar Room (530)\, Cavendish Laboratory\, Department of Phy
 sics
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