Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 41: Correlated Electrons: Quantum-Critical Phenomena

TT 41.3: Vortrag

Mittwoch, 22. März 2017, 10:00–10:15, HSZ 204

Microstructured YbRh2Si2 and YbNi4P2: Magnetoresistance at low temperatures — •Alexander Steppke1, Sandra Hamann1, Markus König1, Andrew P. Mackenzie1, Kristin Kliemt2, Cornelius Krellner2, Heike Pfau3, Ramzy Daou4, and Manuel Brando11MPI for Chemical Physics of Solids, Noethnitzer Str. 40, 01187 Dresden — 2Goethe-Universität Frankfurt, Max-von-Laue Strasse 1, 60438 Frankfurt am Main — 3Stanford Institute for Materials and Energy Science, 2575 Sand Hill Road Menlo Park, California 94025, USA — 4Normandie Univ, ENSICAEN, CNRS, CRISMAT, 14000 Caen, France

With electrical transport measurements providing valuable information about novel phases or topological changes of the Fermi surface we investigated the properties of YbRh2Si2 and YbNi4P2. In the Kondo lattice YbRh2Si2 the recent discovery of a strong change in the ac susceptibility indicates a superconducting state below 2 mK [1]. Yet data of resistive transitions at these temperatures are still absent, due to the challenge of measuring resistances with minimal dissipation. Furthermore magnetoresistance measurements can be used to detect field induced Lifshitz transitions in both systems. Here we show that by modifying the geometry of clean bulk samples using focused ion beam the resistance can be increased by several orders of magnitude without influencing the magnetic or electronic properties. This opens a path to resistance measurements at ultra low temperatures.

[1] E. Schuberth et al. Science 351, 485 (2016)

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