Coherent Optical Phonons in the Iron Oxypnictide SmFeAsO1-xFx (x=0.075)
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概要
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Coherent optical phonons with the Fe-related mode B_{1g}(Fe) in the iron oxypnictide SmFeAsO1-xFx (x = 0.075) are observed using femtosecond time-resolved reflection measurements with electrooptic sampling, in addition to the A_{1g}(Sm) and A_{1g}(As) modes. The time evolution of the frequency and amplitude of optical phonons is studied and the lifetimes of phonons are estimated. The frequency softening and positive frequency chirp related to the strong carrier--phonon coupling are found for the A_{1g}(Sm) mode.
- 2011-01-15
著者
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Hosono Hideo
Materials And Structures Laboratory Tokyo Institute Of Technology
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Kamihara Yoichi
Department Of Applied Physics And Physico-informatics Faculty Of Science And Technology Keio Univers
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Takeda Jun
Faculty Of Engineering Yokohama National University
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Nakamura Kazutaka
Materials And Structures Laboratory Tokyo Institute Of Technology
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Kitajima Masahiro
National Defense Academy of Japan, Yokosuka, Kanagawa 239-8686, Japan
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Takahashi Hiroshi
Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Koguchi Hiroaki
Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Atou Toshiyuki
Materials and Structures Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Katayama Ikufumi
Faculty of Engineering, Yokohama National University, Yokohama 240-8501, Japan
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Takeda Jun
Faculty of Engineering, Yokohama National University, Yokohama 240-8501, Japan
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