Coherent optical phonons in the iron oxypnictide SmFeAsO 1-xFx (x = 0:075)

Hiroshi Takahashi; Yoichi Kamihara; Hiroaki Koguchi; Toshiyuki Atou; Hideo Hosono; Ikufumi Katayama; Jun Takeda; Masahiro Kitajima; Kazutaka G. Nakamura

doi:10.1143/JPSJ.80.013707

Coherent optical phonons in the iron oxypnictide SmFeAsO _1-xF_x (x = 0:075)

Hiroshi Takahashi, Yoichi Kamihara, Hiroaki Koguchi, Toshiyuki Atou, Hideo Hosono, Ikufumi Katayama, Jun Takeda, Masahiro Kitajima, Kazutaka G. Nakamura

Department of Applied Physics and Physico-Informatics

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

Coherent optical phonons with the Fe-related mode B_1g(Fe) in the iron oxypnictide SmFeAsO_1-xF_x (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 carrierphonon coupling are found for the A_1g(Sm) mode.

Original language	English
Article number	013707
Journal	Journal of the Physical Society of Japan
Volume	80
Issue number	1
DOIs	https://doi.org/10.1143/JPSJ.80.013707
Publication status	Published - 2011 Jan

Keywords

Coherent phonons
Femtosecond laser
Iron oxypnictide

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.80.013707

Cite this

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title = "Coherent optical phonons in the iron oxypnictide SmFeAsO 1-xFx (x = 0:075)",

abstract = "Coherent optical phonons with the Fe-related mode B1g(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 A1g(Sm) and A1g(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 carrierphonon coupling are found for the A1g(Sm) mode.",

keywords = "Coherent phonons, Femtosecond laser, Iron oxypnictide",

author = "Hiroshi Takahashi and Yoichi Kamihara and Hiroaki Koguchi and Toshiyuki Atou and Hideo Hosono and Ikufumi Katayama and Jun Takeda and Masahiro Kitajima and Nakamura, {Kazutaka G.}",

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language = "English",

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T1 - Coherent optical phonons in the iron oxypnictide SmFeAsO 1-xFx (x = 0:075)

AU - Takahashi, Hiroshi

AU - Kamihara, Yoichi

AU - Koguchi, Hiroaki

AU - Atou, Toshiyuki

AU - Hosono, Hideo

AU - Katayama, Ikufumi

AU - Takeda, Jun

AU - Kitajima, Masahiro

AU - Nakamura, Kazutaka G.

PY - 2011/1

Y1 - 2011/1

N2 - Coherent optical phonons with the Fe-related mode B1g(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 A1g(Sm) and A1g(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 carrierphonon coupling are found for the A1g(Sm) mode.

AB - Coherent optical phonons with the Fe-related mode B1g(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 A1g(Sm) and A1g(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 carrierphonon coupling are found for the A1g(Sm) mode.

KW - Coherent phonons

KW - Femtosecond laser

KW - Iron oxypnictide

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