Table I: Parameters obtained from fits to C4KHg neutron and x-ray diffraction data. N Hg is the number of Hg atoms per 4 carbon atoms; zK is the distance between the potassium layers and the center of the intercalant sandwich; and deltaz is the separation of the Hg layers.
Table II: A summary of the known differences between the pink and gold C4KHg samples. The numbers here are for a typical sample of a given type, although some variation is observed. indicates type I superconductivity. Hc was determined from for the gold specimens, and from the Hc2(theta) measurements for the pink specimens. is the superconducting coherence length. NA means not applicable.