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Temperature dependence of electron-phonon thermalization and its correlation to ultrafast magnetism

机译:电子-声子热化的温度依赖性及其与超快磁性的关系

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摘要

We report a systematic measurement of the electron-phonon thermalization time scale as a function of the sample base temperature in Ni using femtosecond electron diffraction. A strong temperature dependence of this time scale has been observed in the vicinity of the Curie point. By assuming that ultrafast magnetism completes well before the electron-phonon thermalization, this correlation between thermalization time and sample base temperature fits a modified three-temperature model describing the energy transfer among charge, spin, and phonon subsystems. The results indicate that charges and spins can be characterized by a unified temperature during ultrafast lattice heating.
机译:我们报告了使用飞秒电子衍射对电子-声子热化时间尺度的系统测量,该尺度是镍中样品基本温度的函数。在居里点附近已经观察到该时间尺度的强烈温度依赖性。通过假设超快磁场在电子声子热化之前就已经完成了,热化时间与样品基础温度之间的这种关系拟合了描述电荷,自旋和声子子系统之间的能量转移的改进的三温度模型。结果表明,在超快晶格加热过程中,电荷和自旋可以由统一的温度来表征。

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  • 来源
    《Physical review》 |2010年第22期|P.220301.1-220301.4|共4页
  • 作者单位

    Physics Department and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA;

    rnPhysics Department and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA;

    rnPhysics Department and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA;

    rnPhysics Department and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA;

    rnPhysics Department and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA;

    rnPhysics Department and National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    polaritons (including photon-phonon and photon-magnon interactions);

    机译:极化子(包括光子-声子和光子-磁子相互作用);

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