Document Detail


Can Competition between the crystal field and the Kondo effect cause non-Fermi-liquid-like behavior?
MedLine Citation:
PMID:  16606205     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The recently reported unusual behavior of the static and dynamical magnetic susceptibility as well as the specific heat in Ce(1-x)La(x)Ni9Ge4 has raised the question of a possible non-Fermi-liquid ground state in this material. We argue that for a consistent physical picture the crystal-field splitting of two low-lying magnetic doublets of the Ce 4f-shell must be taken into account. Furthermore, we show that for a splitting of the order of the low temperature scale T* of the system a crossover behavior between an SU(4) and an SU(2) Kondo effect is found. The screening of the two doublets occurs on different temperature scales leading to a different behavior of the magnetic susceptibility and the specific heat at low temperatures. The experimentally accessible temperature regime down to 50 mK still lies in the extended crossover regime into a strong-coupling Fermi-liquid fixed point.
Authors:
Frithjof B Anders; Thomas Pruschke
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Publication Detail:
Type:  Journal Article     Date:  2006-03-01
Journal Detail:
Title:  Physical review letters     Volume:  96     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-04-11     Completed Date:  2006-05-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  086404     Citation Subset:  -    
Affiliation:
Theoretical Physics, University of the Saarland, 66041 Saarbrücken, Germany.
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