Role of elemental mercury in the superconductivity ofHg3−δAsF6

Abstract
Pressure-temperature excursions necessary for conversion of rhombohedral α-Hg to body-centered tetragonal β-Hg have been applied to single crystals of Hg3δAsF6. The superconducting properties of the compound near 4 K are shown to track those of elemental α- and β-Hg which appear to be trapped within the sample.