Superconductivity's Halo: Mapping a Rare High-Field Phase in UTe₂
Posted by Quantum Server Networks • August 2025 In a rare reversal of physics norms, researchers have uncovered a superconducting "halo" that forms only under extreme magnetic fields—challenging long-held assumptions about how superconductors behave. At the heart of this discovery is uranium ditelluride (UTe₂) , a material already known for its unconventional superconductivity, but now revealed to host a mysterious “Lazarus” phase where superconductivity dies and then reemerges at even higher magnetic field strengths. This fascinating work, published in Science , was led by theoretical physicist Andriy Nevidomskyy from Rice University, in collaboration with experimental teams from the University of Maryland (UMD) and the National Institute of Standards and Technology (NIST). A Resurrection Under Pressure In most superconductors, applying a magnetic field suppresses superconductivity, and eventually destroys it entirely beyond a known critical field. But UTe₂ is...