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Lifshitz transition in Kondo alloys
Sébastien Burdin1, Claudine Lacroix
1Université Bordeaux, LOMA, UMR 5798, F-33400 Talence, France.
Physical Review Letters
|June 18, 2013
Summary
Researchers studied Kondo alloys, identifying two Fermi-liquid regimes separated by a Lifshitz transition. This transition, occurring at a specific impurity concentration, may explain observed non-Fermi liquid properties in these systems.
Area of Science:
- Condensed matter physics
- Materials science
- Quantum mechanics
Background:
- Kondo alloys exhibit complex electronic behaviors influenced by magnetic impurities.
- Understanding the transition between different electronic states is crucial for materials design.
Purpose of the Study:
- To investigate the low-energy states of Kondo alloys.
- To characterize Fermi-liquid regimes as a function of impurity concentration and electron occupation.
- To explore the mechanism behind non-Fermi liquid properties.
Main Methods:
- Utilizing mean-field coherent potential approximation.
- Employing the strong-coupling limit approach.
- Analyzing the electronic states based on magnetic impurity concentration (x) and conduction electron occupation (n(c)).
Main Results:
- Identified and characterized two distinct Fermi-liquid regimes.
- Proposed a Lifshitz transition occurring at x=n(c) separating these regimes.
- Predicted a discontinuity in quasiparticle count at the Fermi surface, linked to the transition.
Conclusions:
- The Lifshitz transition at x=n(c) provides a potential explanation for non-Fermi liquid phenomena in Kondo alloys.
- The study offers insights into the fundamental electronic properties of magnetic impurity systems.
- Further experimental validation of the predicted quasiparticle discontinuity is warranted.
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