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We present low-temperature tunneling density-of-states measurements in Al films in high parallel magnetic fields. The thickness range of the films, t=6-9 nm, was chosen so that the orbital and Zeeman contributions to their parallel critical fields were comparable. In this quasispin paramagnetically limited configuration, the field produces a significant suppression of the gap, and at high fields the gapless state is reached. By comparing measured and calculated tunneling spectra we are able to extract the value of the antisymmetric Fermi-liquid parameter G0 and thereby deduce the quasiparticle density dependence of the effective parameter Geff0 across the gapless state. ©2008 The American Physical Society.

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Physical Review B - Condensed Matter and Materials Physics