Superconductivity of amorphous Mg0.7Zn0.3-xGaxalloys

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Abstract
The authors report on low-temperature measurements (0.1K0.7Zn0.3-xGax alloys (0.06<or=x<or=0.20) prepared by melt spinning. Superconductivity is observed for all samples. The transition temperature increases from approximately=0.1K to approximately=0.3K as the Ga concentration increases towards x=0.20. This increase is accomplished by a 10% increase in the electron-phonon coupling constant lambda . The specific heat data show that these alloys are weak-coupling superconductors ( lambda approximately=0.3). The upper critical field measured for x=0.20 is analysed in terms of the WHH theory. Finally, the normal-state specific heat data taken in a magnetic field of 2 T show contributions from Ga nuclei.