Metamaterial approach to superconducting critical temperature increase

A dielectric response function plays a significant role in electron-electron interaction. Recently we proposed that the metamaterial approach to dielectric response engineering may increase the superconducting critical temperature. A composite superconductor-dielectric metamaterial has been tested in experiments with compressed mixtures of tin and barium titanate nanoparticles of varying composition. An increase of the critical temperature of the order of 5 percent compared to bulk tin has been observed [1]. Measurements of dielectric function was found to be in agreement with our model. A role of dielectric and particle size will be demonstrated. Different metamaterial approaches will be discussed [2]. [1]. V. N. Smolyaninova, et al., Scientific Reports 4, 7321 (2014); [2]. I. Smolyaninov and V. N. Smolyaninova, Phys. Rev. B 91, 094501 (2015)