Evidence of dynamical spin shielding in Ce from spin-resolved photoelectron spectroscopyJ. G. Tobin1, S. W. Yu1, T. Komesu2, B. W. Chung1, S. A. Morton1, 2 and G. D. Waddill2
1 Lawrence Livermore National Laboratory - Livermore, CA, USA
2 University of Missouri-Rolla - Rolla, MO, USA
received 29 July 2006; accepted in final form 7 November 2006; published January 2007
published online 5 January 2007
Using Fano effect measurements upon polycrystalline Ce, we have observed a phase reversal between the spectral structure at the Fermi edge and the other 4f derived feature near a binding energy of 2 eV. The Fano effect is the observation of spin polarized photoelectron emission from nonmagnetic materials, under chirally selective excitation, such as circularly polarized photons. The observation of phase reversal between the two peaks is a direct experimental proof of Kondo shielding in Ce, confirming the predictions of Gunnarsson and Shoenhammer, albeit with a small modification.
71.28.+d - Narrow-band systems; intermediate-valence solids .
72.25.Fe - Optical creation of spin polarized carriers .
79.60.-i - Photoemission and photoelectron spectra .
© Europhysics Letters Association 2007