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We have determined the spin polarized density of states (DOS) of 3-d amorphous Gd[sub x]Si[sub 1-x] in the quantum critical regime of a tunable Metal-Insulator Transition (MIT). Using a spin polarized BCS DOS we fit the data and extract the spin polarization P. [ABSTRACT FROM AUTHOR]

Abstract: We have measured the spin polarized tunneling conductance of a thin Al/Al2O3/amorphous Gd x Si1− x planar tunnel junction at T=25mK in parallel magnetic field H⩽3.0T. Abrikosov–Gorkov theory is a better model for the thin superconducting Al electrode than previously used Bardeen–Cooper–Schrieffer theory. As the magnetic field is increased, we find the best fit to the data by modelling a transition from a superconductor with gap (α<1) to a gapless superconductor (α>1). [Copyright &y& Elsevier]