We have previously reported on research to engineer superconductors with higher critical temperatures using metamaterial concepts. Further work has been reported on the SPIE website, suggesting that a "[p]lasmonic metamaterial geometry may enable fabrication of an aluminum-based metamaterial superconductor with a critical temperature that is three times that of pure aluminum."
Superconductors offer the promise of loss-less transmission, and are also used in applications like magnetic resonance imaging. Increasing the critical temperature reduces the cost and complexity of the associated equipent required to place materials into a superconducting state. We will continue to watch this work with interest!