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

Abstract

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

9 pages, 4 figures

References in corpus (6)

• Superconductivity on the border of weak itinerant ferromagnetism in UCoGe
• Itinerant Nature of U 5f States in Uranium Mononitride UN Revealed by Angle Resolved Photoelectron Spectroscopy
• Unconventional critical scaling of magnetization in uranium ferromagnetic superconductors UGe${}_2$ and URhGe
• Itinerant U 5f band states in the layered compound UFeGa5 observed by soft X-ray angle-resolved photoemission spectroscopy
• Itinerant magnetism in URhGe revealed by angle resolved photoelectron spectroscopy
• Electronic structure of UGe${}_2$ at ambient pressure: comparison with X-ray photoemission spectra

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• Electronic structure of ThRu2Si2 studied by angle-resolved photoelectron spectroscopy: Elucidating the contribution of U 5f states in URu2Si2
• Spin-triplet superconductivity in the paramagnetic UCoGe under pressure studied by ${}^{59}$Co NMR
• Pairing interaction in superconducting UCoGe tunable by magnetic field
• Electronic structures of UX${}_3$ (X=Al, Ga, and In) studied by photoelectron spectroscopy
• Mapping out the emergence of topological features in the highly alloyed topological Kondo insulators Sm${}_{1-x}{M}_x$B${}_6$ ($M$=Eu, Ce)