评论两篇声称已观察到超导电性的最低载流子浓度记录的论文
Comment on two papers claiming records for the lowest carrier concentration at which superconductivity has been observed
摘要：
最近的一篇论文和一份预印本都声称记录了观察到超导性的最低载流子浓度。然而，我和澳大利亚的同事在20世纪80年代发现了超导性的证据，在SrTiO_3的陶瓷样品中，用Zr代替了3%的Ti。
英文摘要：
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.
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