Metamagnetic behavior and effect of pressure on the electronic state in heavy-fermion compound YbRh2Zn20

Fuminori Honda, Tetsuya Takeuchi, Shinichi Yasui, Yuki Taga, Shingo Yoshiuchi, Yusuke Hirose, Yoshiharu Tomooka, Kiyohiro Sugiyama, Masayuki Hagiwara, Koichi Kindo, Rikio Settai, Yoshichika Onuki

研究成果: Article査読

5 被引用数 (Scopus)

抄録

We measured the magnetic susceptibility, high-field magnetization, magnetoresistance, specific heat, and Hall coefficient, together with the electrical resistivity under high pressures and magnetic fields, for the heavy-fermion compound YbRh2Zn20 with the cubic CeCr 2Al20-type structure. The metamagnetic behavior was observed at Hm =65 kOe for the magnetic field along the h100i direction below Txmax = 5:3 K, at which the temperature of the magnetic susceptibility indicates a broad maximum. The coefficient A of the T2 dependence of electrical resistivity ρ = ρ0 + AT2 and the electronic specific heat coefficient C=T possess a broad maximum at Hm. The metamagnetic field Hm is found to decrease with increasing pressure and to become zero at a critical pressure Pc ≠ 5:2 GPa. Correspondingly, the A value increases drastically in magnitude, and the Fermi liquid relation is no longer satisfied at 5.2 GPa in zero magnetic field, implying a non-Fermi liquid state. On the other hand, at magnetic fields ofH >20 kOe, the low-temperature resistivity exhibits a T2 dependence even at 5.2 GPa. The A coefficient decreases rapidly with increasing magnetic field. These results indicate that an electronic state at 5.2 GPa corresponds to the quantum critical point.

本文言語English
論文番号084705
ジャーナルjournal of the physical society of japan
82
8
DOI
出版ステータスPublished - 2013 8月 1

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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