Does Mesophase Ag4+xPb2O6-z (0 <= x <= 1, 0,5 <= z <= 0,75) Appeal for a Point Contact ATc Superconductivity?

TL;DR

This study investigates Ag4+xPb2O6-z particles showing diamagnetism and zero resistance at temperatures below 78°C, suggesting potential ambient temperature superconductivity linked to tunneling processes at particle contacts.

Contribution

It demonstrates reproducible synthesis of Ag4+xPb2O6-z with properties indicating possible ambient temperature superconductivity, highlighting the role of point contact tunneling.

Findings

Diamagnetism observed below 78°C

Zero electrical resistance at certain conditions

Reproducible preparation correlates with physical properties

Abstract

Weakly compacted fine particles of Ag4+xPb2O6-z which is iso-structural with Bystroem-Evers oxide Ag5Pb2O6 exhibit a novel class of physical properties, which includes an appearance of diamagnetism at t < 78 degrees Celsius, with corresponding absence of electric resistance, both events sounding for possible superconductivity. Weak compaction was performed by controlled pressing of introductory components Ag2O and PbO2. Pellets were heated from room temperature in an evacuated chamber, and solid state reaction proceeded at 340-350 degrees Celsius in an oxygen atmosphere released by reaction itself (60 < p < 100 mbar). Electric and magnetic properties appealing for an ambient temperature superconductivity may be attributed to scattering processes indicated by tunnelling of Ag-Ag clusters between states localized on the point contacts formed between adjacent particles. As compared to the work on the subject during past two decades, reproducibility of output data is satisfactory, and their correlations to the input preparation conditions appear as to be conclusive.