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Ultrafast electronic relaxation dynamics in a valence fluctuation material Sm0.83Y0.17S

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, , Citation Ryohei Ikeda et al 2019 J. Phys.: Conf. Ser. 1220 012005 DOI 10.1088/1742-6596/1220/1/012005

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hwata@fbs.osaka-u.ac.jp

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1 Department of Physics, Osaka University, Toyonaka 560-0043, Japan

2 Graduate School of Frontier Biosciences, Osaka University, Suita 567-0871, Japan

3 Department of Physics, Nagoya University, Nagoya 464-8602, Japan

4 Institute for Materials Science, Tsukuba 305-0047, Japan

5 Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan

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1742-6596/1220/1/012005

Abstract

We report ultrafast electronic relaxation dynamics of yttrium-doped samarium monosulfide, Sm0.83Y0.17S, which is one of valence fluctuating compounds, by pump-probe measurements. We observed a large increase of the Drude weight in the reflectivity spectrum by the photo-excitation and a double exponential decay of the relaxation time to a metastable state. This suggests that the photo-induced effect can be explained as the change of carrier density. The metastable state has a long lifetime ( > 1 ns) and the carrier density is slightly higher than that before the photo-excitation.

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10.1088/1742-6596/1220/1/012005