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2022/Oct/31 Callum Stevens

Published 31st October 2022 by yairfosado

Discovery of charge density wave order in 3D metallic U2Ti

We consider thermodynamic, transport and x-ray diffraction measurements supporting the formation of a previously unidentified charge density wave (CDW) phase of U2Ti. The CDW is incommensurate, forming at 71 K, and undergoes a commensurate transition at 46 K. This doubles the unit cell along the hexagonal c-axis in a Peierls-like transition as predicted from DFT calculations [1]. This is compared to the unusual CDW in α-U and motivates U2Ti as a simpler system to explore 3D metallic CDW formation.   Additionally, our measurements suggest that U2Ti is not bulk superconductor at ambient pressure in contrast to a previous study [2].

[1] Kaur, G., Jaya, S. M., & Panigrahi, B. K. (2018). Phonon instability and charge density wave in U2Ti. Journal of Alloys and Compounds, 730, 36-41.

[2] Maple, M. B., Torikachvili, M. S., Rossel, C., Chen, J. W., & Hake, R. R. (1985). Four new uranium compound superconductors. Physica B+ C, 135(1-3), 430-433.

2022/Oct/31 Callum Stevens / Personal webpage by blogadmin is licensed under a Creative Commons Attribution CC BY 3.0

Published in ICMCS seminar

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