Issue
EPL
Volume 77, Number 1, January 2007
Article Number 17004
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/77/17004
Published online 05 January 2007
EPL, 77 (2007) 17004
DOI: 10.1209/0295-5075/77/17004

Evidence of dynamical spin shielding in Ce from spin-resolved photoelectron spectroscopy

J. 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

Tobin1@LLNL.Gov

received 29 July 2006; accepted in final form 7 November 2006; published January 2007
published online 5 January 2007

Abstract
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.

PACS
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