SURFACE AND BULK 4F-PHOTOEMISSION SPECTRA OF CEIN3 AND CESN3

Resonant photoemission spectroscopy was performed on CeIn3 and CeSn3 a t the 4d-4f and 3d-4f core thresholds. Using the different surface sen sitivity between the two photon energies, surface and bulk 4f-photoemi ssion spectra were derived for both compounds. With the noncrossing ap proximation of the Anderson impurity model, the 4d-4f resonant spectra together with the surface and bulk spectra were self-consistently ana lyzed to obtain the microscopic parameters such as the 4f-electron ene rgy and the hybridization strength with conduction electrons. The resu lt shows a substantial difference in these parameters between the surf ace and the bulk, indicating that it is important to take into account the surface effect in analyzing photoemission spectra of Ce compounds . It is also found that the 4f surface core-level shift is different b etween CeIn3 and CeSn3.