J. Phys. Soc. Jpn. 76, 043702 (2007) [4 Pages]
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Received January 29, 2007; Accepted February 8, 2007; Published March 26, 2007
Femtosecond reflection spectroscopy was performed on a perovskite-type manganite, Gd 0.55 Sr 0.45 MnO 3 , 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
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