Abstract: The present invention provides a superconducting block, comprising, a pair of cores with materials that are electrically conductive in their normal states. The pair of cores are embedded in the shell with an intervening centroidal distance, with a material that is electrically conductive in its normal state. The embedded pair of cores and the shell are configured to be superconductive. The present invention also provides a superconducting nanocrystal with at least the superconducting block. The present invention also provides a superconductive device with at least the superconducting block and the superconducting nanocrystal. The present invention further provides a process for fabricating the superconducting block and superconducting crystal. The present invention provides superconductors (superconducting block, superconducting nanocrystals) that can be employed to attain superconductivity at high temperatures, corresponding to temperatures existing in the terrestrial ambient and even higher.