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首页> 外文期刊>Physical review >Electron-phonon coupling and the charge gap of spin-density wave iron-pnictide materials from quasiparticle relaxation dynamics
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Electron-phonon coupling and the charge gap of spin-density wave iron-pnictide materials from quasiparticle relaxation dynamics

机译：从准粒子弛豫动力学看电子-声子耦合和自旋密度波-铁离子材料的电荷隙

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摘要

We investigate the quasiparticle relaxation and low-energy electronic structure in undoped SrFe_2As_2 exhibiting spin-density wave (SDW) ordering using optical pump-probe femtosecond spectroscopy. A remarkable critical slowing down of the quasiparticle relaxation dynamics at the SDW transition temperature T_(SDW) =200 K is observed. From temperature dependence of the transient reflectivity amplitude we determine the SDW-state charge gap magnitude, 2Δ_(SDW)/k_BT_(SDW)=7.2± 1. The second moment of the Eliashberg function, λ<(hω)~2>=110± 10 meV~2, determined from the relaxation time above T_(SDW), is similar to SmFeAsO and BaFe_2As_2 indicating a moderate electron phonon coupling.
机译：我们使用光学泵浦飞秒飞秒光谱技术研究了未掺杂SrFe_2As_2表现出自旋密度波（SDW）有序的准粒子弛豫和低能电子结构。观察到在SDW转变温度T_（SDW）= 200 K时准粒子弛豫动力学的显着临界减慢。根据瞬态反射率幅度的温度依赖性，我们确定SDW状态电荷隙幅度2Δ_（SDW）/ k_BT_（SDW）= 7.2±1。Eliashberg函数的第二矩λ<（hω）〜2> = 110由高于T_（SDW）的弛豫时间确定的±10 meV〜2与SmFeAsO和BaFe_2As_2相似，表明存在中等的电子声子耦合。

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  • 来源
    《Physical review》 |2010年第1期|P.012505.1-012505.4|共4页
  • 作者

    L. Stojchevska; P. Kusar; T. Mertelj; V. V. Kabanov; X. Lin; G. H. Cao; Z. A. Xu; D. Mihailovic;

  • 作者单位

    Complex Matter Department, Jozef Stefan Institute, Jamova 39, Ljubljana, SI-1000 Ljubljana, Slovenia;

    Complex Matter Department, Jozef Stefan Institute, Jamova 39, Ljubljana, SI-1000 Ljubljana, Slovenia;

    Complex Matter Department, Jozef Stefan Institute, Jamova 39, Ljubljana, SI-1000 Ljubljana, Slovenia;

    Complex Matter Department, Jozef Stefan Institute, Jamova 39, Ljubljana, SI-1000 Ljubljana, Slovenia;

    Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China;

    Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China;

    Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China;

    Complex Matter Department, Jozef Stefan Institute, Jamova 39, Ljubljana, SI-1000 Ljubljana, Slovenia;

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  • 正文语种 eng
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  • 关键词

    optical properties; spin-density waves;

    机译：光学性质;自旋密度波;

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