Pressure-induced Structural Phase Transition and New Superconducting Phase in UTe₂

We report on the crystal structure and electronic properties of heavy fermion superconductor UTe2 at high pressure up to 11 GPa, as investigated by X-ray diffraction electrical resistivity experiments. The measurements under using a synchrotron light source reveal anisotropic linear compressibility unit cell 3.5 while pressure-induced structural phase transition is observed above PO–T ∼ 3.5–4 GPa room temperature, where body-centered orthorhombic with space group Immm changes into tetragonal I4/mmm. molar volume drops abruptly PO–T, distance between first-nearest neighbor U atoms, dU–U, increases, implying switch from states weakly correlated states. Surprisingly, new superconducting pressures higher than 7 was detected Tsc > 2 K relatively low upper-critical field, Hc2(0). thus, in high-pressure phase, shows large drop below 230 K, which may also be related considerable change