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Title: Photoelectron Spectroscopy of YbInCu{sub 4}: Direct Testing of Correlated Electron Models

Abstract

The electronic properties of single crystal YbInCu{sub 4} have been investigated by means of high resolution photoelectron spectroscopy. A first order, isostructural phase transition for YbInCu{sub 4} at T{sub v}=42 K leads to changes in the Kondo temperature of more than an order of magnitude (27 K vs. 400 K). This phase transition and accompanying Kondo temperature change provide the most direct test of the single impurity model (SIM) to date. Particle hole symmetry allows the SIM to be used for Yb compounds as well as Ce heavy fermions with the great advantage that the predicted Kondo resonance is found on the occupied side of the spectral weight function for Yb materials and is thus directly observable in photoemission. The photoemission results are incongruous with the single impurity model predictions for temperature dependence, binding energy and 4f occupancy, encouraging a reevaluation of the single impurity model. The experiments were conducted using the PGM undulator and 4 meter NIM beamlines at SRC. The spectra were taken at photon energies of 40 eV and 90 eV and the combined energy resolution of the analyzer and monochromator was 45- 85 meV.

Authors:
; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Energy Research, Washington, DC (United States)
OSTI Identifier:
661894
Report Number(s):
LA-UR-97-4211; CONF-9710154-
ON: DE98003006; TRN: AD-a339 570
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: `97 user`s group meeting for the Synchrotron Radiation Center, Madison, WI (United States), 24-25 Oct 1997; Other Information: PBD: [Oct 1997]
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; ELECTRONIC STRUCTURE; BINDING ENERGY; PHOTOELECTRIC EMISSION; COPPER COMPOUNDS; PHOTOELECTRON SPECTROSCOPY; INDIUM COMPOUNDS; YTTERBIUM COMPOUNDS

Citation Formats

Joyce, J J, Arko, A J, Sarrao, J L, and Fisk, Z. Photoelectron Spectroscopy of YbInCu{sub 4}: Direct Testing of Correlated Electron Models. United States: N. p., 1997. Web.
Joyce, J J, Arko, A J, Sarrao, J L, & Fisk, Z. Photoelectron Spectroscopy of YbInCu{sub 4}: Direct Testing of Correlated Electron Models. United States.
Joyce, J J, Arko, A J, Sarrao, J L, and Fisk, Z. 1997. "Photoelectron Spectroscopy of YbInCu{sub 4}: Direct Testing of Correlated Electron Models". United States. https://www.osti.gov/servlets/purl/661894.
@article{osti_661894,
title = {Photoelectron Spectroscopy of YbInCu{sub 4}: Direct Testing of Correlated Electron Models},
author = {Joyce, J J and Arko, A J and Sarrao, J L and Fisk, Z},
abstractNote = {The electronic properties of single crystal YbInCu{sub 4} have been investigated by means of high resolution photoelectron spectroscopy. A first order, isostructural phase transition for YbInCu{sub 4} at T{sub v}=42 K leads to changes in the Kondo temperature of more than an order of magnitude (27 K vs. 400 K). This phase transition and accompanying Kondo temperature change provide the most direct test of the single impurity model (SIM) to date. Particle hole symmetry allows the SIM to be used for Yb compounds as well as Ce heavy fermions with the great advantage that the predicted Kondo resonance is found on the occupied side of the spectral weight function for Yb materials and is thus directly observable in photoemission. The photoemission results are incongruous with the single impurity model predictions for temperature dependence, binding energy and 4f occupancy, encouraging a reevaluation of the single impurity model. The experiments were conducted using the PGM undulator and 4 meter NIM beamlines at SRC. The spectra were taken at photon energies of 40 eV and 90 eV and the combined energy resolution of the analyzer and monochromator was 45- 85 meV.},
doi = {},
url = {https://www.osti.gov/biblio/661894}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 31 00:00:00 EST 1997},
month = {Wed Dec 31 00:00:00 EST 1997}
}

Conference:
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