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首页> 外文期刊>Physical review >Strong spin-phonon coupling unveiled by coherent phonon oscillations in Ca_2RuO_4
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Strong spin-phonon coupling unveiled by coherent phonon oscillations in Ca_2RuO_4

机译：CA_2RUO_4中的相干声子振荡亮相的强旋转声子耦合

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摘要

We utilize near-infrared femtosecond pulses to investigate coherent phonon oscillations of Ca2RuO4. The coherent A(g) phonon mode of the lowest frequency changes abruptly not only its amplitude but also the oscillation phase as the spin order develops. In addition, the phonon mode shows a redshift entering the magnetically ordered state, which indicates a spin-phonon coupling in the system. Density functional theory calculations reveal that the A(g) oscillations result in octahedral tilting distortions, which are exactly in sync with the lattice deformation driven by the magnetic ordering. We suggest that the structural distortions by the spin-phonon coupling can induce the unusual oscillation phase shift between impulsive and displacive type oscillations.
机译：我们利用近红外飞秒脉冲来研究CA2RUO4的相干声子振荡。最低频率的相干A（g）声子模式不仅变化，而且突然变化为旋转顺序的振幅而且振荡阶段。另外，声子模式显示输入磁有序状态的红移，这表示系统中的旋转声子耦合。密度函数理论计算揭示A（g）振荡导致八面体倾斜扭曲，其与由磁性排序驱动的晶格变形完全相同。我们建议通过旋转声子耦合的结构变形可以引起脉冲和位移型振荡之间的异常振荡相移。

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  • 来源
    《Physical review》 |2019年第14期|144306.1-144306.5|共5页
  • 作者

    Lee Min-Cheol; Kim Choong H.; Kwak Inho; Seo C. W.; Sohn Changhee; Nakamura F.; Sow C.; Maeno Y.; Kim E. -A.; Noh T. W.; Kim K. W.;

  • 作者单位

    Inst for Basic Sci Korea CCES Seoul 08826 South Korea|Seoul Natl Univ Dept Phys & Astron Seoul 08826 South Korea;

    Inst for Basic Sci Korea CCES Seoul 08826 South Korea|Seoul Natl Univ Dept Phys & Astron Seoul 08826 South Korea;

    Inst for Basic Sci Korea CCES Seoul 08826 South Korea|Seoul Natl Univ Dept Phys & Astron Seoul 08826 South Korea;

    Inst for Basic Sci Korea CCES Seoul 08826 South Korea|Chungbuk Natl Univ Dept Phys Cheongju 28644 Chungbuk South Korea;

    Inst for Basic Sci Korea CCES Seoul 08826 South Korea|Seoul Natl Univ Dept Phys & Astron Seoul 08826 South Korea;

    Kurume Inst Technol Dept Educ & Creat Engn Fukuoka Fukuoka 8300052 Japan;

    Kyoto Univ Grad Sch Sci Dept Phys Kyoto 6068502 Japan;

    Kyoto Univ Grad Sch Sci Dept Phys Kyoto 6068502 Japan;

    Cornell Univ Dept Phys Ithaca NY 14853 USA;

    Inst for Basic Sci Korea CCES Seoul 08826 South Korea|Seoul Natl Univ Dept Phys & Astron Seoul 08826 South Korea;

    Chungbuk Natl Univ Dept Phys Cheongju 28644 Chungbuk South Korea;

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