%0 Journal Article
%A Womack, F. N.
%A Adams, P. W.
%A Catelani, Gianluigi
%T Spin-polarized tunneling in critically disordered Be-Al bilayers
%J Physical review research
%V 3
%N 2
%@ 2643-1564
%C College Park, MD
%I APS
%M FZJ-2021-02357
%P 023141
%D 2021
%X We report spin-polarized tunneling density of states measurements of the proximity modulated superconductor-insulator transition in ultrathin Be-Al bilayers. The bilayer samples consisted of a Be film of varying thickness, dBe=0.8–4.5nm, on which a 1 nm thick capping layer of Al was deposited. Detailed measurements of the Zeeman splitting of the BCS coherence peaks in samples with sheet resistances R∼h/4e2 revealed a superlinear Zeeman shift near the critical field. Our data suggests that critically disordered samples have a broad distribution of gap energies and that only the higher portion of the distribution survives as the Zeeman critical field is approached. This produces a counterintuitive field dependence in which the gap apparently increases with increasing parallel field.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000655983000003
%R 10.1103/PhysRevResearch.3.023141
%U https://juser.fz-juelich.de/record/892800