Magnetic excitations in the low-temperature ferroelectric phase of multiferroic YMn2O5 using inelastic neutron scattering

We studied magnetic excitations in a low-temperature ferroelectric phase of the multiferroic YMn(2)O(5) using inelastic neutron scattering (INS). We identify low-energy magnon modes and establish a correspondence between the magnon peaks observed by INS and electromagnon peaks observed in optical ab...

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Bibliographic Details
Published in:Physical review letters 2011-08, Vol.107 (9), p.097401-097401
Main Authors: Kim, J-H, van der Vegte, M A, Scaramucci, A, Artyukhin, S, Chung, J-H, Park, S, Cheong, S-W, Mostovoy, M, Lee, S-H
Format: Article
Language:English
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Summary:We studied magnetic excitations in a low-temperature ferroelectric phase of the multiferroic YMn(2)O(5) using inelastic neutron scattering (INS). We identify low-energy magnon modes and establish a correspondence between the magnon peaks observed by INS and electromagnon peaks observed in optical absorption [A. B. Sushkov et al., Phys. Rev. Lett. 98, 027202 (2007).]. Furthermore, we explain the microscopic mechanism, which results in the lowest-energy electromagnon peak, by comparing the inelastic neutron spectral weight with the polarization in the commensurate ferroelectric phase.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.107.097401