Dresden 2026 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Superconductivity – Poster I

TT 22.21: Poster

Montag, 9. März 2026, 18:00–20:00, P1

AuTi Magnetic Penetration Depth Thermometers for low temperature microcalorimeters — •Naemi Grun, Christian Enss, Andreas Fleischmann, Loredana Gastaldo, Daniel Hengstler, Florian Kaiser, Lukas Münch, Andreas Reifenberger, and Martin Schwendele — Kirchhoff Institute for Physics, University Heidelberg

Low temperature microcalorimeters reach high energy resolution in a wide energy range thanks to very sensitive thermometers. Magnetic penetration depth thermometers (MPTs) would represent a very interesting alternative with respect to commonly used metallic magnetic calorimeters (MMCs) and transition edge sensors (TESs). The working principle of MPTs is based on the Meissner-Ochsenfeld effect and the temperature dependence of the magnetic penetration depth. A temperature increase due to energy deposition in the absorber material translates into an increase in the magnetic penetration depth of the MPT, which can be read out by highly sensitive SQUID magnetometers. We are investigating AuTi bilayers as a possible MPT sensor material and are targetting a transition temperature below 100 mK. To avoid hysteretic effects, the sensor does not have a bulk geometry, but is deposited onto the readout coil in the geometry of separate stripes or dots. We discuss the properties of the AuTi bilayers and the results obtained with MPT prototypes based on different geometries.