Femtosecond Reflection Spectroscopy in La_{1.5}Sr_{0.5}CoO_4

• Authors: T. Egawa , Y. Okimoto , R. Fukaya , K. Onda , T. Ishikawa , S. Koshihara , A. Isayama , T. Sasagawa
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

78.47.J-; 78.47.jg

Discipline

• 78.47.jg: Time resolved reflection spectroscopy
• 78.47.J-: Ultrafast spectroscopy (<1>(see also 42.65.Re Ultrafast processes; optical pulse generation and pulse compression; 82.53.Mj Femtosecond probing of semiconductor nanostructures)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 121
• Issue: 2
• Pages: 307-309

Dates

published

2012-02

Contributors

author

T. Egawa

• Department of Materials Science, Tokyo Institute of Technology, Megro-ku, Tokyo 152-8551, Japan

author

Y. Okimoto

• Department of Materials Science, Tokyo Institute of Technology, Megro-ku, Tokyo 152-8551, Japan

author

R. Fukaya

• Department of Materials Science, Tokyo Institute of Technology, Megro-ku, Tokyo 152-8551, Japan
• CREST, JST, Meguro-ku, Tokyo 152-8551, Japan

author

K. Onda

• Department of Environ. Chem. and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 Japan

author

T. Ishikawa

• Department of Materials Science, Tokyo Institute of Technology, Megro-ku, Tokyo 152-8551, Japan

author

S. Koshihara

• Department of Materials Science, Tokyo Institute of Technology, Megro-ku, Tokyo 152-8551, Japan
• CREST, JST, Meguro-ku, Tokyo 152-8551, Japan

author

A. Isayama

• Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 Japan

author

T. Sasagawa

• Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 Japan

References

• [1] For a review, Photoinduced Phase Transitions, Ed. K. Nasu, World Sci., Singapore 2004
• [2] K. Miyano, T. Tanaka, Y. Tomioka, Y. Tokura, Phys. Rev. Lett. 78, 4257 (1997)
• [3] M. Rini, R. Tobey, N. Dean, J. Itatani, Y. Tomioka, Y. Tokura, R.W. Shoenlein, A. Cavalleri, Nature 449, 72 (2007); D. Polli, M. Rini, S. Wall, R.W. Shoenlein, Y. Tomioka, Y. Tokura, G. Cerullo, A. Cavalleri, Nature Mater. 6, 643 (2007)
• [4] Y. Okimoto, X. Peng, M. Tamura, T. Morita, K. Onda, T. Ishikawa, S. Koshihara, N. Todoroki, T. Kyomen, M. Ito, Phys. Rev. Lett. 103, 027402 (2009)
• [5] Y. Okimoto, M. Kurashima, K. Seko, T. Ishikawa, K. Onda, T. Ishikawa, S. Koshihara, T. Kyomen, M. Ito, Phys. Rev. B 83, 161101 (2011)
• [6] I.A. Zaliznyak, J.P. Hill, J.M. Tranquada, R. Erwin, Y. Moritomo, Phys. Rev. Lett. 85, 4353 (2000)
• [7] C.F. Chang, Z. Hu, Hua Wu, T. Burnus, N. Hollmann, M. Benomar, T. Lorenz, A. Tanaka, H.-J. Lin, H.H. Hsieh, C.T. Chen, L.H. Tjeng, Phys. Rev. Lett. 102, 116401 (2009)
• [8] L.M. Helme, A.T. Boothroyd, R. Coldea, D. Prabhakaran, C.D. Frost, D.A. Keen, L.P. Regnault, P.G. Freeman, M. Enderle, J. Kuld, Phys. Rev. B 80, 134414 (2009)
• [9] H. Wu, T. Burnus, Phys. Rev. B 80, 081105(R) (2009)
• [10] H. Okamoto, T. Miyagoe, K. Kobayashi, H. Uemura, H. Nishioka, H. Matsuzaki, A. Sawa, Y. Tokura, Phys. Rev. B 83, 125102 (2011)
• [11] Y. Okimoto, T. Miyata, M.S. Endo, M. Kurashima, K. Onda, T. Ishikawa, S. Koshihara, M. Lorenc, E. Collet, H. Cailleau, T. Arima, Phys. Rev. B 84, 121102(R) (2011)
• [12] Y. Kanamori, H. Matsueda, S. Ishihara, Phys. Rev. Lett. 107, 167403 (2011)

Identifiers

DOI

10.12693/APhysPolA.121.307