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DOE OSTI2020

Materials Data on UBe13 by Materials Project

UBe13 crystallizes in the cubic Fm-3c space group. The structure is three-dimensional. there are two inequivalent Be sites. In the first Be site, Be is bonded in a 12-coordinate geometry to ten Be and two equivalent U atoms. There are a spread of Be–Be bond distances ranging from 2.14–2.36 Å. Both Be–U bond lengths are 2.97 Å. In the second Be site, Be is bonded in a cuboctahedral geometry to twelve equivalent Be atoms. U is bonded in a 1-coordinate geometry to twenty-four equivalent Be atoms.

36 MATERIALS SCIENCE↗

NASA NTRS1987

Quadrupolar Kondo effect in uranium heavy-electron materials?

The possibility of an electric quadrupole Kondo effect for a non-Kramers doublet on a uranium (U) ion is a cubic metallic host is demonstrated by model calculations showing a Kondo upturn in the resistivity, universal quenching of the quadrupolar moment, and a heavy-electron anomaly in the electronic specific heat. With inclusion of excited crystal-field levels, some of the unusual magnetic-response data in the heavy-electron superconductor UBe13 may be understood. Structural phase transitions at unprecedented low temperatures may occur in U-based heavy-electron materials.

Cox, D. L.↗