Finite bias tunneling anomaly in paramagnetically limited Be films

We report measurements of the finite bias anomaly in the tunneling density of states of homogeneously disordered superconducting Be films above the pa ramagnetic limit. To date the anomaly has only been reported in granular Al films and is believed to be a manifestation of a non-perturbative BCS fluc tuation mechanism that forms a pseudo-gap near the Zeeman energy. We show t hat the magnetic field dependence of the anomaly energy in Be films is in g ood agreement with the recent theory of Aleiner and Altshuler provided the proper normal state Lande g-factor is used. (C) 2000 Elsevier Science B.V. All rights reserved.