Spin-Charge-Lattice Coupling through Resonant Multi-Magnon Excitations in Multiferroic BiFeO3
M. O. Ramirez, A. Kumar, S. A. Denev, Y. H. Chu, J. Seidel, L. Martin,, S-Y. Yang R. C. Rai, X. Xue, J. F. Ihlefeld, N. Podraza, E. Saiz, S. Lee, J., Klug, S. W. Cheong, M. J. Bedzyk, O. Auciello, D. G. Schlom, J. Orenstein, R., Ramesh, J. L. Musfeldt, A. P. Litvinchuk
TL;DR
This study demonstrates spin-charge-lattice coupling in multiferroic BiFeO3 through resonant multi-magnon excitations, revealing complex interactions between magnons, phonons, and electronic states at high temperatures.
Contribution
It provides experimental evidence of multi-magnon processes and their resonant enhancements in BiFeO3, highlighting a novel coupling mechanism in multiferroics.
Findings
Observation of two and three magnon excitations
Resonant enhancements of 2-magnon excitation below Neel temperature
Evidence of collective interactions involving electronic resonance, phonons, and multimagnons
Abstract
Spin-charge-lattice coupling mediated by multi-magnon processes is demonstrated in multiferroic BiFeO3. Experimental evidence of two and three magnons excitations as well as multimagnon coupling at electronic energy scales and high temperatures are reported. Temperature dependent Raman experiments show up to five 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
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