Abstract
Ternary molybdenum sulphides containing copper, tin or lead have been prepared, and the crystal structures have been investigated by X-ray diffraction methods. The superconducting critical temperatures have been measured and are slightly higher than those previously found for these compounds. The normal state susceptibilities have been measured, and the magnitudes are rather low, indicating that moderate densities of electronic states exist at the Fermi levels, in contrast with the very high values reported by previous investigators. The upper critical fields of the ternary sulphides are probably very high, and evidence is presented for the existence of a superlattice structure in the compounds containing tin or lead.
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