UTe2 under pressure

Spin-triplet superconductors are a promising route in the search for topological superconductivity, and UTe2 is a recently discovered contender. In this talk, I will present new insights into UTe2 from ac calorimetry, electrical resistivity, and x-ray absorption measurements under applied pressure. Our specific heat data at low pressures, combined with a phenomenological model, show that pressure alters the balance between two closely competing superconducting orders. Above 1.5 GPa, bulk transitions consistent with antiferromagnetic order emerge as the uranium valence starts to increase towards a 4+ (5f2) state. At the end of the talk, I will highlight some of the most pressing outstanding open questions.