Transient differential reflectivity of ferromagnetic and paramagnetic phases in the bilayered manganite La1.24Sr1.76Mn2O7 |
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Authors: | Y. Hirobe Y. Kubo K. Kouyama H. Kunugita K. Ema H. Kuwahara |
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Affiliation: | Department of physics, Sophia University, 7-1, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan |
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Abstract: | Photoinduced effects in a single crystal of bilayered manganites, La2−2xSr1+2xMn2O7 (x=0.38), were investigated in a wide range of temperatures by pump-probe measurement at a photon energy of 1.6 eV. In a ferromagnetic metallic state, significant enhancement of positive rise in differential reflectivity with a slow relaxing time of 100 ps was observed just below TC=127 K, indicating that the reflectivity change with the slow relaxation time constant is induced by laser heating. We have also observed an unconventional fast relaxing component that has a time constant of the order of 10 ps. This fast relaxing component, whose absolute value has an asymmetric peak at TC, is presumably due to short-range correlation of Jahn-Teller distortion. |
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Keywords: | 78.47+p 72.80.Ga 75.40.&minus s |
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