论文标题
（la，ca）$ _ x $ sr $ _ {14-x} $ cu $ _ {24} $ o $ $ $ _ {41} $的证据
Evidence for an orbital dependent Mott transition in the ladders of (La,Ca)$_x$Sr$_{14-x}$Cu$_{24}$O$_{41}$ derived by electron energy-loss spectroscopy
论文作者
论文摘要
CU和O不同轨道之间的电荷载体分布的知识是理解各种Cu-O框架物理特性的前提。我们采用电子损失光谱范围来阐明（la，ca）$ _ x $ sr $ _ {14-x} $ cu $ _ {24} $ o $ $ $ _ {41} $ in $ x $和温度。我们观察到，血浆的能量在增加Ca含量时会增加，这标志着两个Cu-O子系统之间的内部电荷重新分布。此外，与不相关的模型相反，我们得出的结论是，转移到Cu $ _2 $ o $ $ _3 $梯子的孔主要位于债券中，而不是反键入乐队。这是由轨道依赖的莫特过渡引起的。
The knowledge of the charge carrier distribution among the different orbitals of Cu and O is a precondition for the understanding of the physical properties of various Cu-O frameworks. We employ electron energy-loss spectroscopy to elucidate the charge carrier plasmon dispersion in (La, Ca)$_x$Sr$_{14-x}$Cu$_{24}$O$_{41}$ in dependency of $x$ as well as temperature. We observe that the energy of the plasmon increases upon increasing Ca content, which signals an internal charge redistribution between the two Cu-O subsystems. Moreover, contrary to an uncorrelated model we come to the conclusion that the holes transferred to the Cu$_2$O$_3$ ladders are mainly located in the bonding and not in the anti-bonding band. This is caused by an orbital dependent Mott transition.
