Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.1: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Superconducting granular aluminum films grown at cryogenic condition — •Alessandro D’Arnese, Martin Dressel, and Marc Scheffler — 1.Physikalisches Institut, Universität Stuttgart, Germany

Superconducting domes have been observed in many superconductors, raising questions of the driving mechanisms influencing Tc. One such material is granular aluminum, which is composed of aluminum nanograins coupled through thin insulating oxide layers. Granular aluminum has two decisive microscopic length scales: the grain size and the barrier thickness. These govern the fundamental energy scales for superconductivity, namely the superconducting energy gap and the superfluid stiffness, which can be determined with low-frequency optical spectroscopy [1].

In this work we developed a new evaporation setup for the growth of thin granular aluminum films at cryogenic temperatures. Controlling substrate temperature and oxygen pressure allows us to tune grain size and barrier thickness. Towards this goal, we implemented a bath cryostat to reach liquid-helium temperatures for the substrate. This project focuses on growth, characterization, and optimization of granular aluminum films. We also present DC and microwave data as a way of characterizing films and their superconducting energy scales.

[1] Uwe S. Pracht et al., Phys. Rev. B 93, 100503 (2016).

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