Ultrafast thermoelastic dynamics of HoMnO3 single crystals derived from femtosecond optical pump-probe spectroscopy

H. C. Shih, L. Y. Chen, Chih-Wei Luo, Kaung-Hsiung Wu, Jiunn-Yuan Lin, Jenh-Yih Juang, T. M. Uen, J. M. Lee, J. M. Chen, T. Kobayashi

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In this paper, the photo-induced ultrafast thermoelastic dynamics of hexagonal HoMnO3 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 Néel temperature (TN), is intimately correlated to the emergence of a negative component in the transient reflectivity changes (ΔR/R) obtained in temperaturedependent pump-probe experiments. Moreover, the variation in the oscillation period in ΔR/R caused by a strain pulse propagating along the c-axis exhibits an abrupt drop around TN, presumably due to the antiferromagnetic-orderinginduced changes in ferroelectricity.

Original languageEnglish
Article number053003
Pages (from-to)1-11
Number of pages11
JournalNew Journal of Physics
Issue number5
StatePublished - 1 May 2011

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