Abstract
We report measurements of the tunneling density of states (DOS) of ultrathin Al films in which superconductivity is quenched by a parallel magnetic field, ${H}_{\ensuremath{\parallel}}>48\mathrm{kG}$. The normal state DOS not only displays the usual logarithmic zero bias anomaly (ZBA) but also a new anomaly, superimposed on the ZBA, that appears at bias voltages $V\ensuremath{\sim}2{\ensuremath{\mu}}_{B}{H}_{\ensuremath{\parallel}}/e$, the electron Zeeman splitting. Measurements in tilted fields reveal that the Zeeman feature collapses with increasing perpendicular field component, suggesting that it is associated with the Cooper electron-electron interaction channel.
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