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APS » Journals » Phys. Rev. Lett. » Volume 98 » Issue 2
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Phys. Rev. Lett. 98, 027202 (2007) [4 pages]

Electromagnons in Multiferroic YMn2O5 and TbMn2O5

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A. B. Sushkov1, R. Valdés Aguilar1, S. Park2, S-W. Cheong2, and H. D. Drew1
1Materials Research Science and Engineering Center, University of Maryland, College Park, Maryland 20742, USA
2Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

Received 22 September 2006; published 10 January 2007

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Based on temperature dependent far infrared transmission spectra of YMn2O5 and TbMn2O5 single crystals, we report the observation of electric dipole-active magnetic excitations, or electromagnons, in these multiferroics. Electromagnons are found to be directly responsible for the steplike anomaly of the static dielectric constant at the commensurate—incommensurate magnetic transition and are the origin of the colossal magneto-dielectric effect reported in these multiferroics.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.027202
DOI:
10.1103/PhysRevLett.98.027202
PACS:
75.80.+q, 75.30.Ds, 75.47.Lx, 78.30.−j
 
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