Pressure-induced structural phase transition and new superconducting phase in UTe2
| Autor: | Honda, Fuminori, Kobayashi, Shintaro, Kawamura, Naomi, Kawaguchi, Saori, Koizumi, Takatsugu, Sato, Yoshiki J., Homma, Yoshiya, Ishimatsu, Naoki, Gouchi, Jun, Uwatoko, Yoshiya, Harima, Hisatomo, Flouquet, Jacques, Aoki, Dai |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | J. Phys. Soc. Jpn. 92, 044702 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.7566/JPSJ.92.044702 |
| Popis: | We report on the crystal structure and electronic properties of the heavy fermion superconductor UTe2 at high pressure up to 11 GPa, as investigated by X-ray diffraction and electrical resistivity experiments. The X-ray diffraction measurements under high pressure using a synchrotron light source reveal anisotropic linear compressibility of the unit cell up to 3.5 GPa, while a pressure-induced structural phase transition is observed above 3.5-4GPa at room temperature, where the body-centered orthorhombic crystal structure with the space group Immm changes into a body-centered tetragonal structure with the space group I4/mmm. The molar volume drops abruptly at the critical pressure, while the distance between the first-nearest neighbor of U atoms increases, implying a switch from the heavy electronic states to the weakly correlated electronic states. Surprisingly, a new superconducting phase at pressures higher than 7 GPa was detected at Tsc above 2K with a relatively low upper-critical field, Hc2(0). The resistivity above 3.5GPa, thus, in the high-pressure tetragonal phase, shows a large drop below 230 K, which may also be related to a considerable change from the heavy electronic states to the weakly correlated electronic states. Comment: 11 pages, 9 figures |
| Databáze: | arXiv |
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