Electronic structure of ferromagnetic superconductor UGe₂ in comparison to UTe₂

The newly discovered spin-triplet superconductor UTe₂ [1] has a strong suggestive relationship to the family of ferromagnetic superconductors UGe₂, URhGe and UCoGe. Here we update studies [2] of the electronic bandstructure of UGe₂, experimentally measured by angle-resolved photoemission (ARPES) near the U 5d-5f resonance, with comparisons to DFT calculations of ThGe₂ decomposed into subunit building block structures. A signature imprint of a 2D diagonal square-net plane of Ge atoms on the formation of large diamond-shaped Fermi surface contours is shown to agree well with ARPES and with dHvA orbit sizes. Similar theoretical decomposition of the UTe₂ structure into zig-zag U-Te chains and a plane of Te linear chains with strong p-orbital bonding-antibonding splitting identifies the origins of the underlying orthogonal quasi-1D band structures near the Fermi level, in agreement with recent ARPES measurements [3].
[1] S. Ran et al., Science 365, 684 (2019).
[2] Feng Wang, Chap. 5, Ph.D. thesis, Univ. of Michigan, 2007.
[3] Lin Miao et al., Phys. Rev. Lett. 124, 076401 (2020)