| Spin-Charge-Lattice Coupling through Multi-Magnon Excitations in Multiferroic BiFeO3 (2008) | |||||||||
Abstract | |||||||||
| Spin-charge-lattice coupling mediated by multi-magnon processes is demonstrated in multiferroic BiFeO3. Raman, linear and non linear optical spectroscopies show up to six resonant enhancements of the 2-magnon excitation below the Neel temperature. These are shown to be collective interactions between on-site Fe d-d electronic resonance, phonons and multimagnons. These resonances are also observed in the temperature dependence of multimagnon sidebands to electronic levels using nonlinear optical spectroscopy. Combined multi-magnon, electronic and vibrational spectroscopies can sensitively reveal coupled phenomena in multiferroics, particularly where distinguishing magnetic and polar order parameters is a challenge.. Comment: 15 pages including figures. submitted to Physical Review Letters | |||||||||
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