Fig. 1: Characterisation of high purity UTe2.
From: Quasi-2D Fermi surface in the anomalous superconductor UTe2
a Specific heat capacity (Cp) divided by temperature (T) of a UTe2 single crystal measured on warming to 3 K. A single, sharp bulk superconducting transition is exhibited. (Inset) The crystal structure of UTe2. b Resistivity (ρ) versus temperature squared up to 4 K for current sourced along the \(\overrightarrow{a}\) direction. A superconducting transition temperature of 2.1 K is observed (defined by zero resistivity, i.e. below the detection limit of 0.01 μΩ cm). A residual resistivity ratio (RRR, defined in the text) of 900 is found, with a residual resistivity ρ0 ≲ 0.5 μΩ cm, indicative of very high sample purity36,38. (Inset) The same dataset as the main panel extended up to 300 K.
