Field-induced quadrupolar ordered phase for H ∥ 〈111〉 in heavy-fermion compound YbCo2Zn20

Tetsuya Takeuchi, Shingo Yoshiuchi, Masahiro Ohya, Yuki Taga, Yusuke Hirose, Kiyohiro Sugiyama, Fuminori Honda, Masayuki Hagiwara, Koichi Kindo, Rikio Settai, Yoshichika Onuki

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Magnetic susceptibility, high-field magnetization up to 500 kOe, and specific heat in a wide temperature range from 0.06 to 300K were measured for single crystals of the cubic heavy-fermion compound YbCo2Zn 20 in order to elucidate the electronic states of the compound at low temperatures. A strong increase in the magnetic specific heat in the form of Cmag=T below ∼1K is approximately explained by the resonant level model for S = 1=2 with the Kondo temperature TK = 1 K, and an extremely large Cmag=T ≃ 8 J/(K2·mol) below about 0.2K is explained by considering the magnetic entropy of the doublet ground state in the 4f crystalline electric field (CEF) scheme of an Yb 3+ ion, which corresponds to an extremely large electronic specific heat coefficient. The field-induced ordered phase for H k h111i, which has recently been found by low-temperature magnetization measurements, was precisely studied by electrical resistivity and specific heat measurements, and was observed in a limited angular range around the h111i direction. On the basis of CEF analyses, the level crossing of the two lowest CEF states is essentially important to understand the field-induced ordered phase, which can be reduced to a field-induced antiferro-quadrupolar ordering based on the Γ3-type quadrupole moment O20

Original languageEnglish
Article number114703
Journaljournal of the physical society of japan
Volume80
Issue number11
DOIs
Publication statusPublished - 2011 Nov
Externally publishedYes

Keywords

  • Crystalline electric field
  • Field-induced order
  • High-field magnetization
  • Metamagnetic behavior
  • Quadrupole interaction
  • Specific heat
  • YbCoZn

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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