Metamagnetic behavior in a heavy fermion compound YbCo2Zn 20

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

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10 Citations (Scopus)


We studied an electronic state at low temperatures by measuring the specific heat and ac-susceptibility under magnetic fields for a heavy fermion compound YbCo2Zn20. The magnetic specific heat in the form of Cmag/T increases steeply and exhibits an extremely large value 8 J/(K2-mol) below 0.2 K, which corresponds to an electronic specific heat coefficient with a very low Kondo temperature of 0.2-1 K. The magnetic entropy increases rapidly at higher temperatures up to 10 K and reaches Rln8 at 50-60 K, which corresponds to a small crystalline-electric-field (CEF) splitting energy. In addition, we found a metamagnetic anomaly at Hm 5.7 kOe below the characteristic temperature Tχmax =0.32 K, where the temperature dependence of the ac-susceptibility shows a broad peak. Interestingly, the metamagnetic behavior was observed as the double peak at 4.0 and 7.5 kOe in the magnetic field dependence of the specific heat C/T at 95 mK.

Original languageEnglish
Article number012059
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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