Comment on two papers claiming records for the lowest carrier concentration at which superconductivity has been observed

D. M. Eagles

Comment on two papers claiming records for the lowest carrier concentration at which superconductivity has been observed

Superconductivity 2016-04-20 v1

Authors: D. M. Eagles

Abstract

A recent paper and a preprint both claim records for the lowest carrier concentration at which superconductivity has been observed. However colleagues in Australia and I found evidence for superconductivity at concentrations of the order of at least a hundred times lower in the 1980's, in a ceramic sample of SrTiO_3 with 3% of Ti replaced by Zr.

Keywords

superconductivity carrier concentration SrTiO3 zirconium doping ceramic sample record claim comment

Cite

@article{arxiv.1604.05660,
  title  = {Comment on two papers claiming records for the lowest carrier concentration at which superconductivity has been observed},
  author = {D. M. Eagles},
  journal= {arXiv preprint arXiv:1604.05660},
  year   = {2016}
}

Comments

2 pages. This will not be submitted as a comment to Phys. Rev. X as they apparently require a large payment from authors

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