Expansion of the high field-boosted superconductivity in UTe2 under pressure

Magnetic field-induced superconductivity is a fascinating quantum phenomenon, whose origin is yet to be fully understood. The recently discovered spin-triplet superconductor, UTe2, exhibits two such superconducting phases, with the second one reentering in the magnetic field of 45 T and persisting up to 65 T. More surprisingly, in order to induce this superconducting phase, the magnetic field has to be applied in a special angle range, not along any high symmetry crystalline direction. Here we investigated the evolution of this high-field-induced superconducting phase under pressure. Two superconducting phases merge together under pressure, and the zero resistance persists up to 45 T, the field limit of the current study. We also reveal that the high-field-induced superconducting phase is completely decoupled from the first-order field-polarized phase transition, different from the previously known example of field-induced superconductivity in URhGe, indicating superconductivity boosted by a different paring mechanism.

EFFECT OF LIGHT ON THE RESISTANCE OF Bi/Pb SUPERCONDUCTORS SYNTHESIZED BY SOLAR ENERGY

The aim of the work is to expand the capabilities of solar technologies and areas of practical use of superconductors. The effect of white light on the interaction of superconducting ceramics with a magnet at room temperature was investigated. It has been established that the magnet is “ejected” by ceramic samples of nominal Bi1,7Pb0,3Sr2Ca(n-1)CunOy, (n = 5-20) under the influence of white light and there is no effect in the dark. The resistance of Bi/Pb superconducting ceramics is reduced by exposure to light compared to resistance in the dark. The resistance of ceramics containing higher superconducting higher superconducting phases Tc = 267-295 K is lower in comparison with “nitrogen” ceramics Tc = 110-120 K