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We devise a new proximity junction configuration where an s-wavesuperconductivity and the superconductivity of Sr2RuO4 interfere with eachother. We reproducibly observe in such a Pb/Ru/Sr2RuO4 junction with a singlePb electrode that the critical current Ic drops sharply just below the bulk Tcof Sr2RuO4 and furthermore increases again below a certain temperature belowTc. In order to explain this extraordinary temperature dependence of Ic, wepropose a competition effect involving topologically distinct superconductingphases around Ru inclusions. Thus, such a device may be called a "topologicalsuperconducting junction".

Topological competition of superconductivity in Pb/Ru/Sr_2RuO_4 junctions