Superconducting Tunneling in the Low-Temperature Phases of Gallium
H. WühlThe University of North Caroline at Chapel Hill, Chapel Hill, North CarolinaJ. E. JacksonThe University of North Caroline at Chapel Hill, Chapel Hill, North CarolinaC. V. BriscoeThe University of North Caroline at Chapel Hill, Chapel Hill, North Carolina
1968en
ABI
Abstract
The two low-temperature metastable phases of gallium have superconducting energy gap to transition temperature ratios, $\frac{2{\ensuremath{\Delta}}_{0}}{k{T}_{c}}$, of 4.5 for "amorphous" gallium and 3.9 for the crystalline phase, $\ensuremath{\beta}$-Ga. Beta-gallium shows considerable structure in the tunneling current indicating the presence of several well-defined peaks in the phonon density of states. Structure observed in the "amorphous" gallium tunneling current appears to be a smeared-out version of that observed in $\ensuremath{\beta}$-Ga.
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