Distributed hybridization model for quantum critical behavior in magnetic quasicrystals

Junya Otsuki, Hiroaki Kusunose

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number073712
JournalJournal of the Physical Society of Japan
Volume85
Issue number7
DOIs
Publication statusPublished - Jul 15 2016
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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