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arXiv cond-mat/0509268cond-mat.str-el
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Ag $_5$ Pb $_2$ O $_6$的电子能带结构和费米面

Electronic band structure and Fermi surface of Ag$_5$Pb$_2$O$_6$

Tamio Oguchi

摘要:

我们给出了Ag $_5$ Pb $_2$ O $_6$的电子能带结构,它具有层状六方结构,包含一维链和二维的银Kagomé层.半满的导带显示出极其简单的、单一的、近似自由电子的费米面。导带由Pb- $6s$和O- $2p$与Ag-4 d和$5s$混合的反键态组成。与比热数据相比,费米能态密度的质量增强预计可以忽略不计。计算出的费米速度是一致的小各向异性观察到的输运性质。掺杂对电子结构的影响也进行了讨论。

英文摘要:

We present electronic band structure of Ag$_5$Pb$_2$O$_6$ with layered hexagonal structure containing one-dimensional chains and two-dimensional Kagomé layers of silver. A half-filled conduction band shows extremely simple, single nearly-free-electron-like Fermi surface. The conduction band is composed of an antibonding state of Pb-$6s$ and O-$2p$ mixing with Ag-4d and $5s$. Mass enhancement in the state density at the Fermi energy is expected to be negligibly small by comparing with the specific-heat data. Calculated Fermi velocity is consistent with small anisotropy observed in transport properties. Doping effects on the electronic structure are also discussed.

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