Magnetic and fermi surface properties of EuGa4

Ai Nakamura, Yuichi Hiranaka, Masato Hedo, Takao Nakama, Yasunao Miura, Hiroki Tsutsumi, Akinobu Mori, Kazuhiro Ishida, Katsuya Mitamura, Yusuke Hirose, Kiyohiro Sugiyama, Fuminori Honda, Rikio Settai, Tetsuya Takeuchi, Masayuki Hagiwara, Tatsuma D. Matsuda, Etsuji Yamamoto, Yoshinori Haga, Kazuyuki Matsubayashi, Yoshiya UwatokoHisatomo Harima, Yoshichika Onuki

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31 Citations (Scopus)

Abstract

We grew a high-quality single crystal EuGa4 with the tetragonal structure by the Ga self-flux method, and measured the electrical resistivity, magnetic susceptibility, high-field magnetization, specific heat, thermoelectric power and de Haas-van Alphen (dHvA) effect, together with the electrical resistivity and thermoelectric power under pressure. EuGa4 is found to be a Eu-divalent compound without anisotropy of the magnetic susceptibility in the paramagnetic state and to reveal the same magnetization curve between H ∥ [100] and [001] in the antiferromagnetic state, where the antiferromagnetic easy-axis is oriented along the [100] direction below a Néel temperature TN = 16:5 K. The magnetization curve is discussed on the basis of a simple two-sublattice model. The Fermi surface in the paramagnetic state was clarified from the results of a dHvA experiment for EuGa4 and an energy band calculation for a non-4f reference compound SrGa4, which consists of a small ellipsoidal hole-Fermi surface and a compensated cube-like electron-Fermi surface with vacant space in center. We observed an anomaly in the temperature dependence of the electrical resistivity and thermoelectric power at TCDW = 150K under 2 GPa. This might correspond to an emergence of the charge density wave (CDW). The similar phenomenon was also observed in EuAl4 at ambient pressure. We discussed the CDW phenomenon on the basis of the present peculiar Fermi surfaces.

Original languageEnglish
Article number104703
Journaljournal of the physical society of japan
Volume82
Issue number10
DOIs
Publication statusPublished - Oct 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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