Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 18: Superconductivity: Poster

TT 18.59: Poster

Monday, March 18, 2024, 15:00–18:00, Poster C

Material Studies for Magnetic Penetration Depth Thermometers — •F. Kaiser, N. Grun, L. Münch, M. Herbst, M. Renger, D. Hengstler, A. Reifenberger, A. Fleischmann, L. Gastaldo, and C. Enss — KIP, Heidelberg University, Germany

Microcalorimeters are energy-dispersive particle detectors, well known for their applications in high-resolution X-ray spectroscopy. They are operated at mK temperatures and convert the energy of incoming photons into a temperature rise, which can be read out using a temperature-sensitive material. In current magnetic microcalorimeters paramagnetically doped normal-metals are a popular choice for the temperature sensor as they allow for precision X-ray spectroscopy, with their excellent energy resolution over a large energy range combined with a very good linearity.
This contribution discusses superconductors as a potential sensor material. In the form of magnetic penetration depth thermometers, we use the Meißner-Ochsenfeld effect to measure the temperature dependent London penetration depth of the superconducting film with a highly-sensitive SQUID magnetometer. This technology promises an even better energy resolution in exchange for a reduced dynamic range.
With a dedicated, wheatstone-like impedance bridge we measured the superconducting transitions of different superconducting materials (Ti, AlMn 2500 ppm, etc.) and investigated the impact of different sensor geometries.