Superconducting state of metallic nanoclusters and Josephson tunneling networks

•Specific nanoclusters form a new family of high Tc superconductors.•For an isolated cluster the pairing affects its energy spectrum.•Nano-based Josephson tunneling network can transfer a macroscopic superconducting current at high temperatures.•A.c. tunneling network can be synchronized and radiates as a single junction.

Metallic nanoclusters form a new family of high temperature superconductors. In principle, the value of Tc can be raised up to room temperature. In addition, one can observe the Josephson tunneling between two clusters. One can build the nanocluster-based tunneling network capable to transfer a macroscopic supercurrent at high temperatures. Such a network can be synchronized and radiate as single junction.