Crossover phase diagram in heavy fermion compound YbCo2Zn 20

Tetsuya Takeuchi, Masahiro Ohya, Masaki Matsushita, Shingo Yoshiuchi, Fuminori Honda, Rikio Settai, Yoshichika Onuki

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2 Citations (Scopus)


We studied the electronic state and metamagnetic behavior in the heavy fermion compound YbCo2Zn20 by measuring the specific heat, ac-susceptibility, and electrical resistivity under magnetic fields. The magnetic specific heat in the form of Cmag/T increases steeply with decreasing temperature below 10 K and becomes constant with an extremely large value 8 J/(K2-mol) below about 0.2 K, indicating a Fermi-liquid nature in this temperature range. The magnetic entropy increases rapidly below 10 K and reaches Rln8 around 60 K, suggesting a small crystalline-electric-field (CEF) splitting energy. From the precise electrical resistivity measurements, together with the C(H)/T andχac(T) measurements, it was found that there are two crossover lines at low temperatures in the H-T phase diagram for H || 〈100〉. The Fermi-liquid state evolves at lower temperatures than these crossover lines.

Original languageEnglish
Article numberSA052
Journaljournal of the physical society of japan
Issue numberSUPPL. A
Publication statusPublished - Jul 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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