Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 65: Quantum-Critical Phenomena II
TT 65.7: Vortrag
Mittwoch, 14. März 2018, 16:45–17:00, HFT-FT 131
Microstructuring YbRh2Si2: Insights from low temperature resistance — •Alexander Steppke1, Sandra Hamann1, Markus König1, Daniel Hafner1, Andrew P. Mackenzie1, Kristin Kliemt2, Cornelius Krellner2, and Manuel Brando1 — 1MPI for Chemical Physics of Solids, Noethnitzer Str. 40, 01187 Dresden — 2Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, 60438 Frankfurt am Main
In the prototypical Kondo lattice YbRh2Si2 signatures of quantum critical fluctuations, recently discovered superconductivity below 2 mK [1] and topological changes of the Fermi surface [2] are established from different experimental probes.
Still absent are data of the resistive transition into the superconducting state and high-resolution magnetoresistance data to further investigate the topological transitions. Both face a similar challenge of measuring resistance with minimal dissipation at very low temperatures.
We applied focused ion beam structuring to change the geometry and therefore increase the resistance, leading to both a higher resolution and reducing influences from contact resistances. First measurements exhibit an order of magnitude improvement in resolution, revealing quantum oscillations at high applied fields. Additionally the controlled geometry is a first step to explore in-plane strain to change the magnetic properties in the vicinity of the quantum critical point.
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H. Pfau et al., PRL 110, 25 (2013).