TY  - JOUR
AU  - Womack, F. N.
AU  - Adams, P. W.
AU  - Catelani, Gianluigi
TI  - Spin-polarized tunneling in critically disordered Be-Al bilayers
JO  - Physical review research
VL  - 3
IS  - 2
SN  - 2643-1564
CY  - College Park, MD
PB  - APS
M1  - FZJ-2021-02357
SP  - 023141
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000655983000003
DO  - DOI:10.1103/PhysRevResearch.3.023141
UR  - https://juser.fz-juelich.de/record/892800
ER  -