Figure 5
From: Tracking aluminium impurities in single crystals of the heavy-fermion superconductor UBe13
(a) Be@Be12 structural unit with residual electron density maxima, shown by a red isosurface at 1.7 e Å−3, in the Al-free structure model from single crystal X-ray diffraction. (b) Unit cell projection along \([1\,0\,0]\) of UBe13−xAlx with one possible Al site realized. U, Be and Al atoms drawn as blue, grey and red spheres, respectively.
