“…At the same time, the eutectic can be regarded as a granular superconductor composed of large globules, or grains, of Mo 3 Re 2 B x and of filaments of the Mo 3 Re 2 B x and Mo 2 Re 3 B x phases, separated by a normal layer of metallic boron deposited at the interfaces. Thus, our sample may be classified as belonging to the S-N-S class of superconducting eutectics [23], where N is a normal metal and superconductors S and S' can differ with respect to the type of superconductivity, the critical temperature and other basic superconducting parameters. The existence of an interfacial layer of boron appears common in this family of ternary borides and has been found in, for example, W 7 Re 13 B and Mo 7 Re 13 B compounds [15,16].…”