Properties of the Nearly Free Electron Superconductor Ag5Pb2O6 Inferred from Fermi Surface Measurements

TL;DR

This study uses Fermi surface measurements to analyze the superconducting and normal state properties of Ag5Pb2O6, revealing a nearly free electron Fermi surface and deriving key physical parameters.

Contribution

It provides the first detailed Fermi surface characterization of Ag5Pb2O6 and links it to its superconducting and normal state properties.

Findings

Fermi surface is nearly free electron in nature.

Quantitative estimates of penetration depths and coherence length.

Normal state properties like specific heat and resistivity anisotropy are derived.

Abstract

We measured the Fermi surface of the recently discovered superconductor Ag5Pb2O6 via a de Haas-van Alphen rotation study. Two frequency branches were observed and identified with the neck and belly orbits of a very simple, nearly free electron Fermi surface. We use the observed Fermi surface geometry to quantitatively deduce superconducting properties such as the in-plane and out-of-plane penetration depths, the coherence length in the clean limit, and the critical field; as well as normal state properties such as the specific heat and the resistivity anisotropy.