Autor: Okimoto, Y. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Photoinduced Ionic to Neutral Phase Transition in TTF-CA Studied by Time-Resolved Infrared Vibrational Spectroscopy
Autorzy:: Matsubara, Y.
Yoshida, T.
Ishikawa, T.
Okimoto, Y.
Koshihara, S.
Onda, K.
Powiązania:: https://bibliotekanauki.pl/articles/1489994.pdf
Data publikacji:: 2012-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.30.Jw
78.47.D-
78.47.jg
Opis:: We studied the photoinduced ionic to neutral phase transition in tetrathiafulvalene-p-chloranil (TTF-CA) using time-resolved infrared vibrational spectroscopy. By monitoring the charge sensitive $b_{1u}$ $ν_{10}$ band of CA after photoexcitation by a 1.55 eV pulse, we found that the photoinduced N-phase has the same charge of the N-phase in thermal equilibrium and there is no charge variation during the photoinduced phase transition. We also found that the photoinduced N-phase grows through at least two steps over 300 ps.
Źródło:: Acta Physica Polonica A; 2012, 121, 2; 340-342
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Femtosecond Reflection Spectroscopy in $La_{1.5}Sr_{0.5}CoO_4$
Autorzy:: Egawa, T.
Okimoto, Y.
Fukaya, R.
Onda, K.
Ishikawa, T.
Koshihara, S.
Isayama, A.
Sasagawa, T.
Powiązania:: https://bibliotekanauki.pl/articles/1489953.pdf
Data publikacji:: 2012-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.47.J-
78.47.jg
Opis:: Ultrafast optical response has been investigated using fs laser system on a perovskite-type cobalt oxide, $La_{1.5}Sr_{0.5}CoO_4$. After the photoirradiation at room temperature, the time profile of relative change of reflectance (Δ R/R) shows a sudden change within the pulse duration ( ≈ 150 fs) and decays with a lifetime of ≈ 330 fs. The sign of Δ R/R after the photoexcitation is positive in the mid-infrared region (at 0.50 eV) while negative in the visible energy region (at 2.0 eV), implying photoinduced change of the electronic structure after the photoexcitation.
Źródło:: Acta Physica Polonica A; 2012, 121, 2; 307-309
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Slow Dynamics of the Photoinduced Phase Transition in $Pd(dmit)_2$ Salts (dmit = 1,3-dithiol-2-thione-4,5-dithiolate)
Autorzy:: Ishikawa, T.
Tanaka, T.
Fukazawa, N.
Matsubara, Y.
Okimoto, Y.
Onda, K.
Koshihara, S.
Tamura, M.
Kato, R.
Powiązania:: https://bibliotekanauki.pl/articles/1408855.pdf
Data publikacji:: 2012-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.40.Me
78.47.D-
78.47.jg
78.55.Kz
78.66.Qn
Opis:: Slow dynamics of the initially photoinduced state has been observed by the pump-probe type time-resolved reflection spectroscopy in the charge separated phase of the half-filled strong dimer system, $Et_2Me_2Sb[Pd(dmit)_2]_2$ (dmit = 1,3-dithiol-2-thione-4,5-dithiolate). We have succeeded to reproduce the probe photon energy dependence of the time profile qualitatively in the time delay range from 10 ps to 1 ns assuming the dynamical expansion of the domain of the photo-induced dimer-Mott insulating phase in the host charge-separated one.
Źródło:: Acta Physica Polonica A; 2012, 121, 2B; 316-318
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Photoinduced Phase Transition in $Pr_{0.5}Ca_{0.5}CoO_3$ Studied by Sequential Pulse Excitations
Autorzy:: Seko, K.
Okimoto, Y.
Kurashima, M.
Fukaya, R.
Egawa, T.
Ishikawa, T.
Onda, K.
Koshihara, S.
Kyomen, T.
Itoh, M.
Powiązania:: https://bibliotekanauki.pl/articles/1490006.pdf
Data publikacji:: 2012-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.66.-w
78.47.jg
Opis:: A perovskite-type cobalt oxide, $Pr_{0.5}Ca_{0.5}CoO_3$ (PCCO), shows photoinduced phase transition. In this study, we successively irradiated two laser pulses with different intensities to PCCO and probed the transient change of the reflection at 2.0 eV. Assuming propagation of the two different photoinduced metallic states, we could reproduce the time profiles as well as the magnitude in the reflectance change, indicating the fabrication of the photoinduced multilayered thin film in $Pr_{0.5}Ca_{0.5}CoO_3$.
Źródło:: Acta Physica Polonica A; 2012, 121, 2; 369-371
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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