Comment on two papers claiming records for the lowest carrier concentration at which superconductivity has been observed
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 SrTiO3 with 3% of Ti replaced by Zr.
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