Cr $_{1/3}$ NbSe $_2$铁磁转变带增宽的证据
Evidence for the band broadening across the ferromagnetic transition in Cr$_{1/3}$NbSe$_2$
摘要：
用光谱法研究了Cr $_{1/3}$ NbSe $_2$的电子结构。我们观察到两个低能量带间跃迁的顺磁相，分裂成四个峰的化合物进入铁磁状态。能带结构计算表明，这四个峰是向自旋上的Cre $_g$态的带间跃迁.我们发现，低于居里温度的峰分裂是\emph{not}由于自旋上下带的交换分裂，但直接反映了在自发铁磁有序的Cr衍生态的带展宽效应。
英文摘要：
The electronic structure of Cr$_{1/3}$NbSe$_2$ is studied via optical spectroscopy. We observe two low-energy interband transitions in the paramagnetic phase, which split into four peaks as the compound enters the ferromagnetic state. The band structure calculation indicates the four peaks are interband transitions to the spin up Cr e$_g$ states. We show that the peak splitting below the Curie temperature is \emph{not} due to the exchange splitting of spin up and down bands, but directly reflects a band broadening effect in Cr-derived states upon the spontaneous ferromagnetic ordering.
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