Photoemission in YbCu sub 2 Si sub 2 : Problems with the Kondo impurity model

Conference · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5361947

Lawrence, J M ^[1]; Arko, A J; Joyce, J J; Canfield, P C; Fisk, Z; Thompson, J D ^[2]

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1. California Univ., Irvine (United States)
2. Los Alamos National Lab., NM (United States)

We report valence band photoemission results for YbCu{sub 2}Si{sub 2}. The 4f{sup 13}(J=7/2) final state peak, centered 60meV below the Fermi level {epsilon}{sub F}, lacks the temperature dependence and is broader than predicted for a Kondo resonance. Together with the recent photoemission results for cerium compounds, these results raise serious doubts about the Kondo impurity explanation of heavy fermion photoemission. 7 refs., 3 figs.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5361947
• Report Number(s): LA-UR-91-2613; CONF-910903--11; ON: DE91018018
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BINDING ENERGY
COPPER COMPOUNDS
DATA
ELECTRON SPECTROSCOPY
EMISSION
ENERGY
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
INFORMATION
KONDO EFFECT
NUMERICAL DATA
PHOTOELECTRON SPECTROSCOPY
PHOTOEMISSION
SECONDARY EMISSION
SILICON COMPOUNDS
SPECTROSCOPY
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS