4f heavy femion photoelectron spectra do not exhibit the Kondo scale

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:68426

Arko, A J; Joyce, J J; Andrews, A B; Blyth, I R; Barlett, R J; Fisk, Z ^[1]; Canfield, P C; Olson, C G; Benning, P J ^[2]; Poirier, D M; Weaver, J H ^[3]; Riseborough, P S ^[4]

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1. Los Alamos National Laboratory, NM (United States)
2. Iowa Sate Univ., Ames, IA (United States)
3. Univ. of Minnesota, Minneapolis, MN (United States)
4. Polytechnic Univ., Brookyln, NY (United States)

It has been the authors contention for some time that the Single Impurity Anderson Model (SIAM), as extended by Gunnarsson and Schonhammer (GS), or the non-crossing approximation (NCA), does not correctly describe the 4f photoelectron spectra of heavy fermions. Recently they have concentrated on Yb heavy fermions since in these materials the Kondo resonance (KR) is fully occupied and thus accessible via photoemission. In particular, they have repeatedly pointed out that the width, position, spectral weight, lineshape, and temperature dependence of the features assumed to be the KR and its sidebands, are nearly independent of the Kondo temperature, T{sub K}, while at the same time bearing a striking resemblance to the simple 4f core level spectra of pure Yb metal, or of Lu isostructural Lu compounds. It is important to resolve these issues in view of the fundamental nature of the problem.

• Research Organization: Los Alamos National Lab., NM (United States)
• OSTI ID: 68426
• Report Number(s): LA-UR--94-1148; CONF-931247--; ON: DE94009293
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
F STATES
KONDO EFFECT
PHOTOELECTRON SPECTROSCOPY
RARE EARTHS
YTTERBIUM ALLOYS