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• W4308470182 abstract "Uranium ditelluride $({mathrm{UTe}}_{2})$ has attracted recent interest due to its unique superconducting properties, which include the potential for a topological odd-parity superconducting state. Recently, ac-calorimetry measurements under pressure indicate a change in the ground state of ${mathrm{UTe}}_{2}$ from superconducting to antiferromagnetic at 1.4 GPa. Here, we investigate the effect of pressure on the crystal structure of ${mathrm{UTe}}_{2}$ up to 25 GPa at room temperature using x-ray diffraction. We find that ${mathrm{UTe}}_{2}$, which at ambient conditions has an orthorhombic (Immm) structure, transforms to a body-centered tetragonal $(I4/mmm)$ structure at 5 GPa in a quasihydrostatic neon (Ne) pressure-transmitting medium. In the absence of a pressure-transmitting medium, this transformation occurs between 5 and 8 GPa. The data were fit with a third-order Birch-Murnaghan equation of state resulting in values of ${B}_{0}=46.0ifmmodepmelsetextpmfi{}0.6phantom{rule{0.16em}{0ex}}mathrm{GPa}$, ${B}^{ensuremath{'}}=9.3ifmmodepmelsetextpmfi{}0.5$ (no pressure medium), and ${B}_{0}=42.5ifmmodepmelsetextpmfi{}2.0phantom{rule{0.16em}{0ex}}mathrm{GPa}$, ${B}^{ensuremath{'}}=9.3$ (fixed) (neon pressure medium) for the Immm phase. For the $I4/mmm$ phase, ${B}_{0}=78.9ifmmodepmelsetextpmfi{}0.5phantom{rule{0.16em}{0ex}}mathrm{GPa}$ GPa and ${B}^{ensuremath{'}}=4.2ifmmodepmelsetextpmfi{}0.1$ (no pressure-transmitting medium), and ${B}_{0}=70.0ifmmodepmelsetextpmfi{}1.1phantom{rule{0.16em}{0ex}}mathrm{GPa}$ and ${B}^{ensuremath{'}}=4.1ifmmodepmelsetextpmfi{}0.2$ (neon pressure medium). The high-pressure tetragonal phase is retained after decompression to ambient pressure, with approximately $30%$ remaining after 2 days. We argue that the observed phase transition into a higher-symmetry structure at $Pensuremath{sim}5phantom{rule{0.16em}{0ex}}mathrm{GPa}$ (orthorhombic to tetragonal) is accompanied by an increase in the shortest distance between uranium atoms from 3.6 AA{} (orthorhombic) to 3.9 AA{} (tetragonal), which suggests localization of the $5f$ electrons, albeit with a 10.7% decrease in volume." @default.
• W4308470182 created "2022-11-12" @default.
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• W4308470182 date "2022-11-07" @default.
• W4308470182 modified "2023-10-16" @default.
• W4308470182 title "Metastable phase of <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>UTe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> formed under high pressure above 5 GPa" @default.
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• W4308470182 doi "https://doi.org/10.1103/physrevmaterials.6.114801" @default.
• W4308470182 hasPublicationYear "2022" @default.
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