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arXiv · 1703.03681

Zeeman-limited Superconductivity in Crystalline Al Films

Philip W. Adams·Hyoungdo Nam·Chih-Kang Shih·Gianluigi Catelani
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Abstract

We report the evolution of the Zeeman-mediated superconducting phase diagram (PD) in ultra-thin crystalline Al films. Parallel critical field measurements, down to 50 mK, were made across the superconducting tricritical point of films ranging in thickness from 7 ML to 30 ML. The resulting phase boundaries were compared with the quasi-classical theory of a Zeeman-mediated transition between a homogeneous BCS condensate and a spin polarized Fermi liquid. Films thicker than $\sim$20 ML showed good agreement with theory, but thinner films exhibited an anomalous PD that cannot be reconciled within a homogeneous BCS framework.

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Philip W. Adams, Hyoungdo Nam, Chih-Kang Shih, Gianluigi Catelani. 2017-03-10. Zeeman-limited Superconductivity in Crystalline Al Films. https://doi.org/10.1103/physrevb.95.094520

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