2024/03/11 by Z. Wu, Jiasheng Chen, Wu, Zheyu +15 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Condensed matter physics #Iron-based superconductors research #Physics #Radioactive element chemistry and processing #Rare-earth and actinide compounds #Superconductivity
paper · pdf · doi:10.48550/arxiv.2403.06650
published in arXiv (Cornell University) (Cornell University)
openalex publication_date 2024/03/11 · openalex created_date 2024/03/13 · openalex updated_date 2026/08/06
The phase diagram of the heavy fermion compound UTe2 contains multiple superconducting phases, several of which show characteristics of odd-parity pairing. We have investigated the pressure dependence of the superconducting transition in high-quality crystals of UTe2 by tracking its signature in the magnetic susceptibility χ(T). A single, sharp superconducting transition is observed at low pressures 0.3 GPa. At higher pressure, a second feature emerges in χ(T), which is located at the lower-temperature thermodynamic phase boundary previously identified in specific heat measurements. This second transition anomaly in χ(T) can be attributed to a step change in the London penetration depth, providing direct evidence for a change in the superconducting order parameter of UTe2. Thermodynamic constraints suggest that the low temperature, high pressure superconducting state is distinct from zero pressure superconductivity as well as from the high pressure, high temperature superconducting state, raising the possibility of multicomponent superconductivity in high pressure UTe2.