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Microstructuring YbRh<sub>2</sub>Si<sub>2</sub> for resistance and noise measurements down to ultra-low temperatures
Abstract The discovery of superconductivity in the quantum critical Kondo-lattice system YbRh 2 Si 2 at an extremely low temperature of 2 mK has inspired efforts to perform high-resolution electrical resistivity measurements down to this temperature range in highly conductive materials. Here we show that control over the sample geometry …