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Role of spin fluctuations in the conductivity of CrO_2

机译：自旋涨落在CrO_2电导率中的作用

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摘要

We present a time-resolved terahertz spectroscopic study of the half-metallic ferromagnet CrOv The ultrafast conductivity dynamics excited by an optical pump displays very short (several picoseconds) and a very long (several hundred picoseconds) characteristic time scales. We attribute the former to the electron-phonon relaxation and the latter to the spin-lattice relaxation. We use this distinction to quantify the relative contribution of the scattering by spin fluctuations to the resistivity of CrO_2: We find that they contribute less than one half of all scattering events below room temperature. This contribution rises to ~70% as the temperature approaches T_C = 390 K. The small effect of spin fluctuations on the resistivity is unexpected in light of the proposed double-exchange nature of the electronic and magnetic properties of CrO_2.
机译：我们介绍了半金属铁磁体CrOv的时间分辨太赫兹光谱研究。由光泵激发的超快电导动力学显示出非常短的（几皮秒）和非常长的（几百皮秒）特征时间尺度。我们将前者归因于电子声子弛豫，而后者归因于自旋晶格弛豫。我们利用这种区别来量化自旋起伏对CrO_2电阻率的散射的相对贡献：我们发现，在室温以下，它们的贡献少于所有散射事件的一半。当温度接近T_C = 390 K时，这一贡献增加到约70％。鉴于拟议的CrO_2电子和磁性双交换性质，自旋涨落对电阻率的微小影响是出乎意料的。

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  • 来源
    《Physical review》 |2016年第16期|165143.1-165143.7|共7页
  • 作者

    Kate H. Heffernan; Shukai Yu; Skylar Deckoff-Jones; Xueyu Zhang; Arunava Gupta; D. Talbayev;

  • 作者单位

    Department of Physics and Engineering Physics, Tulane University, 6400 Freret Street, New Orleans, Louisiana 70118, USA;

    Department of Physics and Engineering Physics, Tulane University, 6400 Freret Street, New Orleans, Louisiana 70118, USA;

    Department of Physics and Engineering Physics, Tulane University, 6400 Freret Street, New Orleans, Louisiana 70118, USA;

    Department of Chemistry, University of Alabama, Tuscaloosa, Alabama 35487, USA;

    Department of Chemistry, University of Alabama, Tuscaloosa, Alabama 35487, USA;

    Department of Physics and Engineering Physics, Tulane University, 6400 Freret Street, New Orleans, Louisiana 70118, USA;

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