Dense Kondo compound UCu5Sn - electronic structure and x-ray photoemission

The electronic structure of the paramagnetic phase of the dense Kondo, moderate heavy-fermion compound UCu5Sn was studied by x-ray photoemission and by calculations. The band structure was calculated using the tight-binding linear muffin-tin orbital method in the atomic sphere approximation. The calculated x-ray spectrum is in reasonable agreement with the experimental one. The electronic specific heat enhancement factor is γ/γ0∼11, pointing out the essential role played by the Kondo-type many-body interactions. A complex satellite structure of the core 4f spectrum from U is an indication of a possibly mixed valence state of uranium in UCu5Sn. (author)