Spin-polarized INS study of dynamic magnetoelastic coupling in CuBr2
Type-II multiferroic spiral magnets are expected to possess strong magnetoelastic coupling and may host hybrid fundamental excitations that involve both spin and lattice degrees of freedom. A thorough and generic understanding of these effects will benefit from experimental studies of structurally simple material systems. CuBr2 was recently discovered to be a type-II multiferroic spiral magnet with a remarkably simple crystal and magnetic structure. Our previous spin-unpolarized INS measurements on single crystals of CuBr2 have revealed highly pronounced phonon anomalies at the dispersion intersecting points of phonons and spin waves, and our preliminary spin-polarized INS study of the spin waves have indicated a possible local minimum in the spin-flip intensity at the same Q-E locations. These results suggest the opening of a gap in the spin wave spectrum and the presence of strong hybridization between phonons and spin waves. Here we propose to verify the possible existence of a local minimum in the magnetic intensity at the phonon-spin-wave dispersion intersecting point, using the high-flux cold-neutron INS spectrometer ThALES (or IN12, depending on availability).
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LI Yuan; Bourges; HU Biaoyan; REGNAULT Louis Pierre and STEFFENS Paul. (2016). Spin-polarized INS study of dynamic magnetoelastic coupling in CuBr2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1499
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