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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.

Additional information

Authors: HAVELA L, JRC Karlsruhe (DE);ALMEIDA T, JRC Karlsruhe (DE);NAEGELE J R, JRC Karlsruhe (DE);SECHOVSKY V, Charles University, Department of Metal Physics, Prague (CS);BRÜCK E, University of Amsterdam, Van der Waals-Zeeman Laboratory, Amsterdam (NL)
Bibliographic Reference: Paper presented : 19th Rare Earth Research Conference, Lexington (US), July 14-17, 1991
Availability: Available from (1) as Paper EN 36394 ORA
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