Title: Ultrafast thermoelastic dynamics of HoMnO(3) single crystals derived from femtosecond optical pump-probe spectroscopy
Authors: Shih, H. C.
Chen, L. Y.
Luo, C. W.
Wu, K. H.
Lin, J-Y
Juang, J. Y.
Uen, T. M.
Lee, J. M.
Chen, J. M.
Kobayashi, T.
Department of Electrophysics
Institute of Physics
Issue Date: 3-May-2011
Abstract: In this paper, the photo-induced ultrafast thermoelastic dynamics of hexagonal HoMnO(3) single crystals has been studied by using optical pump-probe spectroscopy. The thermoelastic effect in the ab-plane of hexagonal HoMnO3, associated with giant magnetoelastic coupling around the Neel temperature (T(N)), is intimately correlated to the emergence of a negative component in the transient reflectivity changes (Delta R/R) obtained in temperature-dependent pump-probe experiments. Moreover, the variation in the oscillation period in Delta R/R caused by a strain pulse propagating along the c-axis exhibits an abrupt drop around T(N), presumably due to the antiferromagnetic-ordering-induced changes in ferroelectricity.
URI: http://dx.doi.org/10.1088/1367-2630/13/5/053003
ISSN: 1367-2630
DOI: 10.1088/1367-2630/13/5/053003
Volume: 13
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