Distributed Hybridization Model for Quantum Critical Behavior in Magnetic Quasicrystals

A quantum critical behavior of the magnetic susceptibility was observed in a quasicrystal containing ytterbium. At the same time, a mixed-valence feature of Yb ions was reported, which appears to be incompatible with the magnetic instability. We derive the magnetic susceptibility by expressing the q...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 2016-07, Vol.85 (7), p.1-1
Main Authors: Otsuki, Junya, Kusunose, Hiroaki
Format: Article
Language:English
Subjects:
Crystals
Electrons
Instability
Ions
Magnetic permeability
Magnetic susceptibility
Magnetism
Occupation
Quantum dots
Quasicrystals
Stability
Strength
Ytterbium
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Summary:A quantum critical behavior of the magnetic susceptibility was observed in a quasicrystal containing ytterbium. At the same time, a mixed-valence feature of Yb ions was reported, which appears to be incompatible with the magnetic instability. We derive the magnetic susceptibility by expressing the quasiperiodicity as the distributed hybridization strength between Yb 4f and conduction electrons. Assuming a wide distribution of the hybridization strength, the most f electrons behave as renormalized paramagnetic states in the Kondo or mixed-valence regime, but a small number of f moments remain unscreened. As a result, the bulk magnetic susceptibility exhibits a nontrivial power-law-like behavior, while the average f-electron occupation is that of mixed-valence systems. This model thus resolves two contradictory properties of Yb quasicrystals.
ISSN:0031-9015
1347-4073