Jul, 2016
Distributed Hybridization Model for Quantum Critical Behavior in Magnetic Quasicrystals
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
- ,
- Volume
- 85
- Number
- 7
- First page
- 073712
- Last page
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.7566/JPSJ.85.073712
- Publisher
- PHYSICAL SOC JAPAN
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.
- Link information
- ID information
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- DOI : 10.7566/JPSJ.85.073712
- ISSN : 0031-9015
- Web of Science ID : WOS:000378729500013