Itinerant U5fband states in the layered compoundUFeGa5observed by soft x-ray angle-resolved photoemission spectroscopy

Abstract

We have performed angle-resolved photoemission spectroscopy (ARPES) experiments on paramagnetic UFeGa 5 using soft X-ray synchrotron radiation (hν=500 eV) and derived the bulk-and U 5f -sensitive electronic structure of UFeGa 5 . Although the agreement between the experimental band structure and the LDA calculation treating U 5f electrons as being itinerant is qualitative, the morphology of the Fermi surface is well explained by the calculation, suggesting that the U 5f states can be essentially understood within the itinerant-electron model.

Single-crystal growth and physical properties of URhIn5

“…10,11 Consistent with this, the Fermi surfaces of the uranium 115 compounds experimentally determined by means of de Haas-van Alphen (dHvA) or angular-resolved photoemission (ARPES) are well explained by band calculations where 5f electrons are treated as band electrons, namely 5f electrons can be regarded as itinerant. [12][13][14][15][16][17][18] Among them, URhGa 5 is a nonmagnetic metal with semimetallic behavior. 16 Its magnetic susceptibility is almost constant as a function of temperature, in contrast to the magnetic ground state observed in NpRhGa 5 19,20 and the temperature-dependent paramagnetic behavior in the superconductor PuRhGa 5 .…”

Integrated experimental setup for angle resolved photoemission spectroscopy of transuranic materials

“…This continuing effort on Uranium ARPES proves to be very useful in our understanding of all aspects of the electronic structure of actinides. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] At the same time, no transuranic ARPES data have been available. The ARPES approach adds the momentum information, and allows to directly visualize the energyand momentum-resolved electronic band structure of a material, hence allowing, e.g., direct comparison with theoretical calculations of dispersion, or effective mass of the bands of interest.…”

Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy

“…5f -electrons have been studied in U-based compounds. While some materials such as UPd 3 , UGe 2 , and USb 2 do seem well-described by the periodic Anderson model (Beaux et al, 2011), other materials such as UFeGa 5 are better understood in an itinerant 5f -electron model (Fujimori et al, 2006). One U-compound which has attracted significant attention is URu 2 Si 2 due to the observation of a phase transition in the specific heat at T HO = 17.5 K (Palstra et al, 1985).…”