Article

Photoemission study of the uranium ternary compounds U3T3X4 (T = Ni, Cu; X = Sn, Sb)

Faculty of Integrated Arts and Sciences, Hiroshima University, Hiroshima 730 Japan; Faculty of Science, Hiroshima University, Hiroshima, 730, Japan
Solid State Communications DOI:10.1016/0038-1098(92)90772-2 pp.433-436

ABSTRACT Valence-band structures of U3Ni3Sn4, U3Ni3Sb4, U3Cu3Sn4 and U3Cu3Sb4 ranging from a semiconductor to a heavy fermion system, are studied using photoemission spectroscopy with synchrotron radiation. We found that the Ni3d band in U3Ni3Sn4 is not fully filled up, the Cu 3d states in the ferromagnet U3Cu3Sb4 are strongly hybridized with the Sb 5p states, but the 3d states are localized in the heavy-fermion compound U3Cu3Sn4. However, the U 5⨍ emission spectra obtained by the resonant photoemission technique are nearly identical for all compounds and have an asymmetric peak of 1.6 eV in width.

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Keywords

3d states
 
asymmetric peak
 
compounds
 
Cu 3d states
 
ferromagnet U3Cu3Sb4
 
heavy fermion system
 
heavy-fermion compound U3Cu3Sn4
 
photoemission spectroscopy
 
resonant photoemission technique
 
Sb 5p states
 
semiconductor
 
U 5⨍ emission spectra
 
Valence-band structures