- 著者
- Tomimoto S. Matsubara M. Ogasawara T. Okamoto H. Kimura T. Tokura Y.
- 出版者
- American Physical Society
- 雑誌
- Physical review letters (ISSN:00319007)
- 巻号頁・発行日
- vol.98, no.1, pp.017402, 2007-01
- 被引用文献数
- 17
Optical manipulation of the magnetic anisotropy is demonstrated for bilayered manganites, La2-2xSr1+2xMn2O7, by means of femtosecond Kerr-rotation measurements. Upon the photoexcitation on the x=0.32 crystal, the magnetization exhibits the precessional motion for about 1 ns, revealing the directional change of the magnetocrystalline anisotropy from the c axis to the ab plane. This change of the anisotropy induces the nonthermal decrease of the c-axis magnetization component for about 1 ns.
- 著者
- Tomimoto S. Miyasaka S. Ogasawara T. Okamoto H. Tokura Y.
- 出版者
- American Physical Society
- 雑誌
- Physical review B (ISSN:01631829)
- 巻号頁・発行日
- vol.68, no.3, pp.035106, 2003
- 被引用文献数
- 38 24
The photoinduced effect on the orbital-ordered phase in perovskite-type LaVO3 has been investigated by femtosecond time-resolved reflection spectroscopy. Large reflectivity change has been observed immediately after photoirradiation. The spectral shape and polarization dependence of the reflectivity change indicate the melting of the orbital order induced by photoexcitation. The photocarriers annihilate in about 200 fs, and the orbital order partially recovers owing to thermalization with the lattice in 2–4 ps.
- 著者
- Tomimoto S. Nansei H. Saito S. Suemoto T. Takeda J. Kurita S.
- 出版者
- American Physical Society
- 雑誌
- Physical review letters (ISSN:00319007)
- 巻号頁・発行日
- vol.81, no.2, pp.417-420, 1998-07
- 被引用文献数
- 77 58
Self-trapped-exciton (STE) luminescence of quasi-one-dimensional halogen-bridged platinum complex [Pt(en)2] [Pt(en)2Cl2] (ClO4)4 is investigated by femtosecond time-resolved luminescence spectroscopy. In the high energy tail of the luminescence band, a fast rise and decay are seen, whereas around the luminescence peak energy a slow rise of about 500 fs is observed. This rise becomes faster at the low energy side of the band. These results are consistently explained by the cooling of prethermalized STEs, following the rapid self-trapping which is estimated to occur within 140 fs.