Exceptional type-I superconductivity of the layered silver oxide Ag${}_5$Pb${}_2$O${}_6$

Abstract

We report zero-resistivity transition and the details of magnetic transition of a layered silver oxide Ag${}_5$Pb${}_2$O${}_6$ single crystal, which make definitive evidence of superconductivity in this compound. In the AC susceptibility of a mono-crystal, we observed large supercooling, as well as positive peaks in the real part of the susceptibility indicating the reversibility of magnetic process. These observations reveal that Ag${}_5$Pb${}_2$O${}_6$ is probably the first oxide that shows type-I superconductivity. Evaluation of the superconducting parameters not only gives confirming evidence of type-I superconductivity, but also indicates that it is a dirty-limit superconductor. We also analyze supercooling to determine the upper limit of the Ginzburg-Landau parameter.

v2: PACS numbers are added

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