Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.46: Poster
Montag, 17. März 2025, 15:00–18:00, P4
Identification of Noise Sources in Superconducting Microstructures — •Markus Renger, Anton Jarecka, Daniel Hengstler, Matthew Herbst, David Mazibrada, Lukas Münch, Andreas Reifenberger, Christian Ständer, Rui Yang, Andreas Fleischmann, Loredana Gastaldo, and Christian Enss — Kirchhoff-Institute for Physics, Heidelberg University
Improving the performance of superconducting devices often means identifying and eliminating different noise sources. Many noise sources are independent of the specific experimental set-up and transferable across many device categories such as qubits, SQUIDs, and superconducting detectors. We have constructed a stand-alone device with which we can analyze specific noise sources in a representative manner. This device consists of a Wheatstone-like bridge of four micro-fabricated superconducting inductors, two of which filled with sample material, and a pair of two-stage dc-SQUID read-out chains. We can use the method of cross-correlation, to derive the total noise contribution of our device, or AC-drive the Wheatstone bridge to measure the complex AC susceptibility of the sample material. Our experiments are performed at temperatures between T = 20 mK and T = 800 mK in the frequency range from f= 100 mHz to f= 100 kHz. We discuss the design of the experimental holder with excellent thermal coupling and shielding. We present the results of multiple measurements on thin films of SiO2, Ag:Er, as well as Au:Er and perform a detailed comparison. In addition, we demonstrate our device’s ability to probe the dynamics of magnetic moments in the sample material.