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TT: Fachverband Tiefe Temperaturen
TT 92: Transport – Poster
TT 92.3: Poster
Donnerstag, 12. März 2026, 18:00–20:00, P4
Advances in building a cryogenic scanning NV magnetometer — •Kilian Srowik1,2, Lotte Boer1, Hayden Binger1, Young-Gwan Choi1, Ahmet Ünal1, Luminita Harnagea2,4, Sabine Wurmehl2, Bernd Büchner2,3, and Uri Vool1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Leibniz Institute for Solid State and Materials Research, IFW Dresden, Dresden, Germany — 3Institute for Solid State and Materials Physics, TU Dresden, Dresden, Germany — 4Indian Institute of Science Education and Research, Pune, India
In the last decade, the Nitrogen-Vacancy (NV) defect in diamond has emerged as an ideal quantum sensor to probe magnetic stray fields. By using a diamond nanopillar, containing a single NV center, as the tip of an atomic force microscope (AFM), it becomes possible to perform Scanning NV magnetometry (SNVM). This configuration not only enables us to measure with high spatial resolution and sensitivity, it also makes a broad temperature range accessible. While room temperature NV systems are widely used already, cryogenic NV setups still remain sparse. At the MPI CPfS, we are in the final stages of building a cryogenic SNVM setup, capable of measuring at variable temperatures down to 1.8K. This paves the way to study a multitude of interesting phenomena, like magnetic phase transitions and superconductivity. In particular, we want to focus on investigating the magnetic structure of unconventional superconductors, like the recently emerged Weyl semimetal γ-PtBi2, reported to have superconducting surface states with a nodal superconducting gap structure.
Keywords: Quantum sensing; Nitrogen-Vacancy; Superconductivity; Topological material