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

TL;DR

This paper investigates the electronic band structure and Fermi surface of Ag$_5$Pb$_2$O$_6$, revealing a simple nearly-free-electron Fermi surface and minimal mass enhancement, with implications for its transport properties.

Contribution

The study provides detailed calculations of the electronic structure of Ag$_5$Pb$_2$O$_6$, highlighting its nearly-free-electron Fermi surface and analyzing doping effects.

Findings

Single nearly-free-electron-like Fermi surface

Negligible mass enhancement at the Fermi level

Small anisotropy in transport properties

Abstract

We present electronic band structure of Ag$_5$Pb$_2$O$_6$ with layered hexagonal structure containing one-dimensional chains and two-dimensional Kagom\'{e} 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.