High-resolution photoemission on UPdSn and UNiAl
High-resolution UPS experiments were performed on two selected uranium ternary compounds, namely UNiAl, which is a heavy-fermion antiferromagnet, and UPdSn, where local U-magnetic moments and gamma values of 5 mJ/mol.K2 point to localised 5f states. Valence band spectra were recorded for 16.7 eV, 21.2 eV, 40.8 eV and 48.4 eV excitation energies with resolution better than 50 meV. No specific sharp feature to explain the high gamma value was found in UNiAl, which displays the 5f emission spread from Fermi energy down to -1 eV. A broad maximum at about -2 eV consists mainly of the Ni-3d response. In UPdSn, part of the 5f emission is concentrated into a broad feature centred around -0.6 eV, whereas the 5f emission at Fermi energy is partially suppressed. A narrow Pd 4d band is found as far as 4 eV below the Fermi energy. Consequently, the 5f-d hybridisation is reduced, which explains the more localised behaviour of UPdSn compared to other UTX compounds.
Bibliographic Reference: Paper presented : 19th Rare Earth Research Conference, Lexington (US), July 14-17, 1991
Availability: Available from (1) as Paper EN 36394 ORA
Record Number: 199111446 / Last updated on: 1994-12-02
Original language: en
Available languages: en