Electronic structures of ferromagnetic superconductors UGe2 and UCoGe studied by angle-resolved photoelectron spectroscopy
Shin-ichi Fujimori, Takuo Ohkochi, Ikuto Kawasaki, Akira Yasui, Yukiharu Takeda, Tetsuo Okane, Yuji Saitoh, Atsushi Fujimori, Hiroshi Yamagami, Yoshinori Haga, Etsuji Yamamoto, Yoshichika Ōnuki
DOI 10.1103/PhysRevB.91.174503 · Physical Review B
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Abstract
The electronic structures of the ferromagnetic superconductors UGe2 and UCoGe in the paramagnetic phase were studied by angle-resolved photoelectron spectroscopy using soft x rays (hν=400–500eV). The quasiparticle bands with large contributions from U5f states were observed in the vicinity of EF, suggesting that the U5f electrons of these compounds have an itinerant character. Their overall band structures were explained by the band-structure calculations treating all the U5f electrons as being itinerant. Meanwhile, the states in the vicinity of EF 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 U5f and Co3d states in UCoGe were found by the Co2p−3d resonant photoemission experiment, suggesting that Co3d states have finite contributions to the magnetic, transport, and superconducting properties.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | 1.2 GPa | unknown |
| UCoGe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.8 | Pressure unresolved | unknown |
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