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J. Phys. Soc. Jpn. 76 (2007) 043702 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Ultrafast Photoinduced Formation of Metallic State in a Perovskite-type Manganite with Short Range Charge and Orbital Order

Yoichi Okimoto1, Hiroyuki Matsuzaki2, Yasuhide Tomioka1, Istvan Kezsmarki3, Takeshi Ogasawara1, Masakazu Matsubara1, Hiroshi Okamoto1,2, and Yoshinori Tokura1,3

1Correlated Electron Research Center (CERC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562
2Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561
3Department of Applied Physics, University of Tokyo, Tokyo 113-8656

(Received January 29, 2007; Accepted February 8, 2007; Published March 26, 2007)

Femtosecond reflection spectroscopy was performed on a perovskite-type manganite, Gd0.55Sr0.45MnO3, with the short-range charge and orbital order (CO/OO). Immediately after the photoirradiation, a large increase of the reflectivity was detected in the mid-infrared region. The optical conductivity spectrum under photoirradiation obtained from the Kramers–Kronig analyses of the reflectivity changes demonstrates a formation of a metallic state. This suggests that ferromagnetic spin arrangements occur within the time resolution (∼200 fs) through the double exchange interaction, resulting in an ultrafast CO/OO to FM switching. ©2007 The Physical Society of Japan

KEYWORDS: photoinduced phase transition, perovskite-type manganite, ultrafast phenomena, optical conductivity
URL: http://jpsj.ipap.jp/link?JPSJ/76/043702/
DOI: 10.1143/JPSJ.76.043702


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