Point contact spectroscopy study of UTe₂ junctions

Superconducting UTe₂ has attracted wide interest for its unique characteristics such as its reentrant superconductivity and proposed spin triplet superconductivity. However, identifying an exact order parameter has proved quite difficult, with various NMR, ultrasound, stress and other experiments yielding at least 8 proposed representations. Here, we make hard point contact junctions between UTe₂ crystals and Pt/Ir tips to investigate the nonlinear current-voltage behavior through the junctions. We present point contact junctions formed with varying barrier strengths and with multiple growth methods. The results of these differential conductance spectra at various temperatures and fields, once compared to BTK theory, can provide insight into the superconducting order parameter of UTe₂.