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A recent proposal that the metamaterial approach to dielectric responseengineering may increase the critical temperature of a compositesuperconductor-dielectric metamaterial has been tested in experiments withcompressed mixtures of tin and barium titanate nanoparticles of varyingcomposition. An increase of the critical temperature of the order of 0.15 Kcompared to bulk tin has been observed for 40% volume fraction of bariumtitanate nanoparticles. Similar results were also obtained with compressedmixtures of tin and strontium titanate nanoparticles.

Experimental demonstration of superconducting critical temperature increase in electromagnetic metamaterials