Photoemission from Ce alloys at high resolution

This short review presents recent photoemission data from Ce based heavy fe rmion materials. Results from polycrystalline samples taken using an unprec edented instrumental energy resolution confirm that high energy spectroscop ic data and thermodynamic data can be interpreted within a unified framewor k. The advantages of applying angle resolved photoemission to study well-ch aracterised single crystal surfaces is then illustrated using two examples. Finally, spectroscopic results from the Kondo insulator Ce3Bi4Pt3 are pres ented. These data demonstrate how the influence of long range order in Ce K ondo systems can be approached, and show, in a dramatic way, the necessity for an instrumental resolution which is correctly adapted to the system und er consideration. (C) 1999 Elsevier Science B.V. All rights reserved.