Pressure-induced super heavy fermion state and antiferromagnetism in YbIr2Zn20

Fuminori Honda, Yuki Taga, Shinichi Yasui, Shingo Yoshiuchi, Yusuke Hirose, Tetsuya Takeuchi, Rikio Settai, Yoshichika Onuki

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1 Citation (Scopus)

Abstract

We studied an effect of pressure on the electronic state of YbIr 2Zn20under magnetic fields. The heavy fermion state at ambient pressure is found to be changed into an antiferromagnetic state at pressures larger than a critical pressure Pc≃ 5.2 GPa, where the electronic state indicates a superheavy fermion state with an order of the electronic specific specific heat coefficient γ = 20 J/(K 2·mol). The temperature dependence of the electrical resistivity shows a characteristic two-peak structure above 5.0 GPa, implying the combined phenomena between the Kondo effect and the crystalline electric field effect. At 7.6 GPa, the magnetoresistance shows a broad maximum at a critical field Hc, corresponding to a pressure-induced antiferromagnetic phase with the Néel temperature TN = 1.4 K. TN increases with further increasing pressure.

Original languageEnglish
Article numberSB063
Journaljournal of the physical society of japan
Volume81
Issue numberSUPPL.B
DOIs
Publication statusPublished - Sep 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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