Multiferroic hexagonal RMnO3: a model system for 2D triangular lattice antiferromagnets

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• Prof. Je-Geun Park. 1-Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul. 2-Department of Physics and Astronomy, Seoul National University, Seoul
• Tuesday 19 January 2016, 15:00-16:00
• TCM Seminar Room (530), Cavendish Laboratory, Department of Physics.

If you have a question about this talk, please contact Helen Verrechia.

Two-dimensional triangular lattice has been the source of rich physics with its generic frustration effects. We have investigated the spin-lattice coupling and magnetism of the two-dimensional triangular lattice in hexagonal RMnO3. Hexagonal RMnO3 belongs to a class of multiferroic materials with both ferroelectric and antiferromagnetic transitions in a single compound. One of salient features of RMnO3 is that Mn ions form a natural 2D triangular lattice with a noncollinear 120 structure. In 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 coupling and (ii) the spin waves. First, by using high-resolution neutron and synchrotron diffraction studies we demonstrated that a strong spin-lattice coupling lies at the heart of the magnetoelectric coupling in these compounds. Second, I will discuss how the spin waves measured by inelastic neutron scattering techniques allowed us to not only confirm the existence of a strong spin-lattice coupling but also unravel unusual nonlinear magnon interaction effects in these materials somewhat unexpectedly.

This talk is part of the Quantum Matter Seminar series.

This talk is included in these lists:

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• Neurons, Fake News, DNA and your iPhone: The Mathematics of Information
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• TCM Seminar Room (530), Cavendish Laboratory, Department of Physics
• Thin Film Magnetic Talks

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