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,Jaechoul Lee,Jin-Ming Chen,Takayoshi Kobayashi,Takayoshi Kobayashi +10 more
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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.Abstract:
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 Neel temperature (TN), is intimately correlated to the emergence of a negative component in the transient reflectivity changes (ΔR/R) obtained in temperature-dependent 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-ordering-induced changes in ferroelectricity.read more
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Ultrafast photoinduced mechanical strain in epitaxial BiFeO3 thin films
Li-Yi Chen,Jan Chi Yang,Chih-Wei Luo,C. W. Laing,Kaung-Hsiung Wu,Jing-Wei Lin,T. M. Uen,Jenh-Yih Juang,Ying-Hao Chu,Takayoshi Kobayashi,Takayoshi Kobayashi +10 more
TL;DR: In this article, the authors studied ultrafast dynamics and photoinduced mechanical strain of BiFeO3 thin films by dual-color transient reflectivity measurements (ΔR/R).
Journal ArticleDOI
Phonon dynamics in CuxBi2Se3 (x = 0, 0.1, 0.125) and Bi2Se2 crystals studied using femtosecond spectroscopy
H. J. Chen,Kaung-Hsiung Wu,Chih-Wei Luo,T. M. Uen,Jenh-Yih Juang,Jiunn-Yuan Lin,Takayoshi Kobayashi,Hung-Duen Yang,Raman Sankar,Fangcheng Chou,Helmuth Berger,Jiang Liu +11 more
TL;DR: In this paper, phonon dynamics in Bi, Bi2Se2, and CuxBi2Se3 single crystals were investigated using femtosecond pump-probe spectroscopy, and two damped oscillations in measured transient reflectivity changes were attributed to coherent optical and acoustic phonons.
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System size dependence of the log-periodic oscillations of transverse momentum spectra
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Room-temperature ferromagnetism in nitrogen-doped BaTiO3
TL;DR: The nitrogen-doped BaTiO 3 with a tetragonal phase has been synthesized in the NH 3 (67%)/Ar atmosphere by the standard solid-state reaction method.
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Giant magneto-elastic coupling in multiferroic hexagonal manganites
Seongsu Lee,A.N. Pirogov,Kang,Kwang-hyun Jang,Masao Yonemura,T. Kamiyama,Sang-Wook Cheong,Fabia Gozzo,Namsu Shin,Hiroyuki Kimura,Yukio Noda,Je-Geun Park +11 more
TL;DR: In this paper, the hexagonal manganites RMnO3 undergo an isostructural transition with exceptionally large atomic displacements: two orders of magnitude larger than those seen in any other magnetic material, resulting in an unusually strong magneto-elastic coupling.
References
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