Abstract
Single crystals of ferromagnetic UAsSe have been investigated by angle-resolved photoemission spectroscopy (ARPES) in the photon energy range between and . Electron kinetic energy intensities are collected as a function of angle and mapped onto the materials reciprocal space. Energy-band mapping has been carried out both for a several-eV-wide energy interval as well as for a narrow energy interval of less than from the Fermi energy. The main features of the deduced energy bands can be explained by band-structure calculations. In the interval close to the Fermi energy, the very high energy and momentum resolution allows the observation of a narrow, yet dispersive photoemission peak mainly of character situated within of the Fermi energy. The Lorentzian linewidth was found to be about with a dispersion of along the to direction and dispersion along the to direction in the Brillouin zone. We have also found broader (linewidth about ), hybridized -character bands with a conventional dispersion of about along the to and the to directions in the Brillouin zone. An intriguing electronic structure emerges for UAsSe in which both relatively dispersive and narrow bands are present. The occurrence of -band dispersions stipulates that the electronic structure of UAsSe requires lattice periodicity to be taken into account.
3 More- Received 4 July 2005
DOI:https://doi.org/10.1103/PhysRevB.73.155119
©2006 American Physical Society