SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Poster Session: Disordered and Granular Superconductors: Fundamentals and Applications in Quantum Technology

TT 22.7: Poster

Donnerstag, 30. September 2021, 13:30–16:00, P

Growth of superconducting granular aluminum films on cryogenically cooled substrates — •Aniruddha Deshpande, Jan Pusskeiler, Martin Dressel, and Marc Scheffler — 1. Physikalisches Institut, Universität Stuttgart, Stuttgart, Germany

Granular aluminum (grAl) consisting of nanometer-sized aluminum grains separated by aluminum oxide has peculiar superconducting properties. The critical temperature can be substantially enhanced compared to pure bulk aluminum up to 3.7K and the low superfluid density of grAl is promising for applications in quantum circuits. The material properties of grAl can be tuned during thin-film growth by parameters such as oxygen pressure and substrate temperature. Here we use thermal evaporation of aluminum and deposition in low-pressure oxygen environment onto cryogenically cooled substrates to reduce the grain size compared to room-temperature growth, and we characterize the grAl films for their temperature-dependent sheet resistance and their superconducting critical temperature.