Mo $_{1-x}$ Re $_x$合金电子结构的共振光电子能谱研究
Electronic structure of the Mo$_{1-x}$Re$_x$ alloys studied through resonant photoemission spectroscopy
摘要：
利用价带光电子能谱和态密度计算方法，研究了富钼Mo $_{1-x}$ Re $_x$合金（0 $\leq$ x $\leq$ 0.4）的电子结构.光电子能谱与态密度计算的比较表明，相对于费米能级$E_F$，$d$态主要位于0 ~-6 eV的结合能范围内，而$s$态位于-4 ~-10 eV的结合能范围内.我们已经观察到两个共振在每个样品的光电子能谱，一个在约35 eV的光子能量和其他在约45 eV的光子能量。我们的分析表明，在35 eV光子能量处的共振与Mo $4p$ - $5s$跃迁有关，在45 eV光子能量处的共振与Mo $4p$ - $4d$跃迁（阈值：42 eV）和Re $5p$ - $5d$跃迁（阈值：46 eV）的贡献有关。在CIS图中，结合能特征在$E_F$（B.E. = 0）至-5 eV的变化随着Re浓度$x$的增加逐渐变得不那么显著，并且对于$x>$ 0.2消失。从Mo $_{1-x}$ Re $_x$合金的价带光电子能谱中减去Mo的价带光电子能谱得到的差值图表明，当Re与Mo合金化时，在$E_F$附近出现了Re $d$类态。这些结果表明，带间$s$-$d$相互作用，这是弱的Mo，增加与$x$的合金中的超导电性的影响与较高的$x$增加。
英文摘要：
We have studied the electronic structure of Mo rich Mo$_{1-x}$Re$_x$ alloys (0$\leq$ x $\leq$0.4) using valence band photoemission spectroscopy in the photon energy range 23-70 eV and density of states calculations. Comparison of the photoemission spectra with the density of states calculations suggests that with respect to the Fermi level $E_F$, the $d$ states lie mostly in the range 0 to -6 eV binding energy whereas $s$ states lie in the range -4 to -10 eV binding energy. We have observed two resonances in the photoemission spectra of each sample, one at about 35 eV photon energy and other at about 45 eV photon energy. Our analysis suggest that the resonance at 35 eV photon energy is related to the Mo $4p$-$5s$ transition and the resonance at 45 eV photon energy is related to the contribution from both the Mo $4p$-$4d$ transition (threshold: 42 eV) and Re $5p$-$5d$ transition (threshold: 46 eV). In the CIS plot, the resonance at 35 eV incident photon energy for binding energy features in the range of $E_F$ (B.E. = 0) to -5 eV becomes progressively less prominent with the increasing Re concentration $x$ and vanishes for $x>$ 0.2. The difference plots obtained by subtracting the valence band photoemission spectrum of Mo from that of Mo$_{1-x}$Re$_x$ alloys, measured at 47 eV photon energy, reveal that the Re $d$ like states appear near $E_F$ when Re is alloyed with Mo. These results indicate that interband $s$-$d$ interaction, which is weak in Mo, increases with the increasing $x$ and influences the nature of superconductivity in the alloys with higher $x$.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
