Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-02-05
Physics
Condensed Matter
Strongly Correlated Electrons
4 figures
Scientific paper
10.1143/JPSJ.76.043702
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 (ca. 200 fs) through the double exchange interaction, resulting in an ultrafast CO/OO to FM switching.
Kezsmarki Istvan
Matsubara Masakazu
Matsuzaki Hiroyuki
Ogasawara Takeshi
Okamoto Hiroshi
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