Journal Article

FZJ-2021-02357

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Spin-polarized tunneling in critically disordered Be-Al bilayers

Womack, F. N. ; Adams, P. W. (Corresponding author) ; Catelani, G.FZJ*

2021
APS College Park, MD

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Please use a persistent id in citations: http://hdl.handle.net/2128/27831  doi:10.1103/PhysRevResearch.3.023141

Abstract: 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.

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Contributing Institute(s):

1. JARA Institut Quanteninformation (PGI-11)

Research Program(s):

1. 522 - Quantum Computing (POF4-522) (POF4-522)

Appears in the scientific report 2021

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