Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 41: Correlated Electrons: Quantum-Critical Phenomena

TT 41.3: Talk

Wednesday, March 22, 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 Brando¹ — ¹MPI 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)