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The electronic structures of the ferromagnetic superconductors$\mathrm{UGe}_2$ and $\mathrm{UCoGe}$ in the paramagnetic phase were studied byangle-resolved photoelectron spectroscopy using soft X-rays ($h\nu =400-500$).The quasi-particle bands with large contributions from $\mathrm{U}~5f$ stateswere observed in the vicinity of $E_\mathrm{F}$, suggesting that the$\mathrm{U}~5f$ electrons of these compounds have an itinerant character. Theiroverall band structures were explained by the band-structure calculationstreating all the $\mathrm{U}~5f$ electrons as being itinerant. Meanwhile, thestates in the vicinity of $E_\mathrm{F}$ show considerable deviations from theresults of band-structure calculations, suggesting that the shapes of Fermisurface of these compounds are qualitatively different from the calculations,possibly caused by electron correlation effect in the complicated bandstructures of the low-symmetry crystals. Strong hybridization between$\mathrm{U}~5f$ and $\mathrm{Co}~3d$ states in $\mathrm{UCoGe}$ were found bythe $\mathrm{Co}~2p-3d$ resonant photoemission experiment, suggesting that$\mathrm{Co}~3d$ states have finite contributions to the magnetic, transport,and superconducting properties.

Electronic structures of ferromagnetic superconductors $\mathrm{UGe}_2$ and $\mathrm{UCoGe}$ studied by angle-resolved photoelectron spectroscopy