Evidence for possible 4f bands at T>>TK in the heavy-fermion single crystal CePt2+x
Abstract
We report the observation of strong amplitude variations with k in the 4f photoelectron spectra of a nearly trivalent heavy-fermion compound (CePt2+x). The amplitude of the 4f feature, previously identified as the Kondo resonance, displays the full symmetry of the lattice, suggesting some band character already at T~=10TK. Kondo lattice-derived bands are expected to exist only at T<<TK, so that this would seem to favor conventional bands at high T. The single-impurity model by contrast demands purely localized behavior at these temperatures.
- Publication:
-
Physical Review B
- Pub Date:
- February 1995
- DOI:
- 10.1103/PhysRevB.51.3277
- Bibcode:
- 1995PhRvB..51.3277A
- Keywords:
-
- 71.28.+d;
- 79.60.-i;
- 33.60.Cv;
- Narrow-band systems;
- intermediate-valence solids;
- Photoemission and photoelectron spectra;
- Ultraviolet and vacuum ultraviolet photoelectron spectra