Ga $_{1-x}$ Mn $_{x}$ As}的铁磁性和红外电动力学
Ferromagnetism and infrared electrodynamics of Ga$_{1-x}$Mn$_{x}$As}
摘要：
我们报告的磁性和电子性质的原型稀磁半导体Ga $_{1-x}$ Mn $_x$ As使用红外光谱（IR）。铁磁转变温度$T_C$相对于IR光谱权重的趋势进行检查使用IR电导率谱的求和规则分析。我们发现$T_C$的非单调行为的趋势与光谱重量有效Mn的比例，这表明一个强大的双交换组件FM机制，并强调了重要的作用，杂质状态和本地化的费米能级。红外电导率的光谱特征被跟踪，因为它们随着温度的变化，掺杂，退火，反位补偿，并被发现只与锰诱导的IB方案是一致的。此外，我们对这些光谱特征的详细探索表明，在文献中报道的关于Ga $_{1-x}$ Mn $_x$ As中载流子密度的宽中红外共振的看似矛盾的趋势实际上并不矛盾。因此，我们的研究提供了一个一致的实验图片的磁性和电子性质的Ga $_{1-x}$ Mn $_x$ As。
英文摘要：
We report on the magnetic and the electronic properties of the prototype dilute magnetic semiconductor Ga$_{1-x}$Mn$_x$As using infrared (IR) spectroscopy. Trends in the ferromagnetic transition temperature $T_C$ with respect to the IR spectral weight are examined using a sum-rule analysis of IR conductivity spectra. We find non-monotonic behavior of trends in $T_C$ with the spectral weight to effective Mn ratio, which suggest a strong double-exchange component to the FM mechanism, and highlights the important role of impurity states and localization at the Fermi level. Spectroscopic features of the IR conductivity are tracked as they evolve with temperature, doping, annealing, As-antisite compensation, and are found only to be consistent with an Mn-induced IB scenario. Furthermore, our detailed exploration of these spectral features demonstrates that seemingly conflicting trends reported in the literature regarding a broad mid-IR resonance with respect to carrier density in Ga$_{1-x}$Mn$_x$As are in fact not contradictory. Our study thus provides a consistent experimental picture of the magnetic and electronic properties of Ga$_{1-x}$Mn$_x$As.
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