Zr. Wang et al., SUPERCONDUCTIVITY IN THE TRANSITION METAL-RICH LAYERED COMPOUND NBXTA5-XS2 (X=1.72), Physica. C, Superconductivity, 252(1-2), 1995, pp. 138-140
Superconductivity below 4 K is reported for the layered compound NbxTa
5-xS2 (x = 1.72), which contains metal-bonded Nb-Ta sheets bordered by
sulfur layers, where the sulfur-metal-sulfur layer blocks are weakly
van der Waals bonded to adjacent ones.