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Applied Physics Letters / Volume 94 / Issue 16 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 94, 161905 (2009); http://dx.doi.org/10.1063/1.3118576 (3 pages)

Spin-charge-lattice coupling through resonant multimagnon excitations in multiferroic BiFeO3

M. O. Ramirez1, A. Kumar1, S. A. Denev1, Y. H. Chu2,3, J. Seidel2,3, L. W. Martin2, S.-Y. Yang2, R. C. Rai4, X. S. Xue4, J. F. Ihlefeld1,2, N. J. Podraza1, E. Saiz2, S. Lee5, J. Klug6,7, S. W. Cheong5, M. J. Bedzyk6,7, O. Auciello7, D. G. Schlom1, J. Orenstein3, R. Ramesh2,3, J. L. Musfeldt4, A. P. Litvinchuk8, and V. Gopalan1

1Department of Materials Science and Engineering and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA
2Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
3Department of Physics, University of California, Berkeley, California 94720-1760, USA
4Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, USA
5Department of Physics and Astronomy Rutgers Center of Emergent Materials, Rutgers, The State University of New Jersey, 136 Frelinghuysen Road, Piscataway, New Jersey 08854-8019, USA
6Materials Research Center, Northwestern University, Evanston, Illinois 60208, USA
7Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
8Department of Physics and Texas Center for Superconductivity and Advanced Materials, University of Houston, Houston, Texas 77204-5002, USA

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(Received 27 December 2008; accepted 24 March 2009; published online 21 April 2009)

Spin-charge-lattice coupling mediated by multimagnon processes is demonstrated in multiferroic BiFeO3. Experimental evidence of two- and three-magnon 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 two-magnon excitation below the Néel temperature. These are shown to be collective interactions between on-site Fe d-d electronic resonance, phonons, and multimagnons.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

bismuth compounds, ferroelectric materials, ferroelectric transitions, magnons, multiferroics, Neel temperature, phonon-magnon interactions, phonons, Raman spectra

PACS

  • 77.80.B-

    Phase transitions and Curie point

  • 63.20.kk

    Phonon interactions with other quasiparticles

  • 75.30.Kz

    Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

  • 78.30.Hv

    Other nonmetallic inorganics

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3118576

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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