Magnetic and Fermi Surface Properties of EuGa4

被引：40

作者：

Nakamura, Ai ^{[1
]}

Hiranaka, Yuichi ^{[1
]}

Hedo, Masato ^{[2
]}

Nakama, Takao ^{[2
]}

Miura, Yasunao ^{[3
]}

Tsutsumi, Hiroki ^{[3
]}

Mori, Akinobu ^{[3
]}

Ishida, Kazuhiro ^{[3
]}

Mitamura, Katsuya ^{[3
]}

Hirose, Yusuke ^{[3
]}

Sugiyama, Kiyohiro ^{[3
,4
]}

Honda, Fuminori ^{[3
]}

Settai, Rikio ^{[3
]}

Takeuchi, Tetsuya ^{[4
,5
]}

Hagiwara, Masayuki ^{[4
]}

Matsuda, Tatsuma D. ^{[6
]}

Yamamoto, Etsuji ^{[6
]}

Haga, Yoshinori ^{[6
]}

Matsubayashi, Kazuyuki ^{[7
]}

Uwatoko, Yoshiya ^{[7
]}

Harima, Hisatomo ^{[8
]}

Onuki, Yoshichika ^{[2
,3
,6
]}

机构：

[1] Univ Ryukyus, Grad Sch Engn & Sci, Nishihara, Okinawa 9030213, Japan

[2] Univ Ryukyus, Fac Sci, Nishihara, Okinawa 9030213, Japan

[3] Osaka Univ, Grad Sch Sci, Toyonaka, Osaka 5600043, Japan

[4] Osaka Univ, KYOKUGEN, Toyonaka, Osaka 5608531, Japan

[5] Osaka Univ, Low Temp Ctr, Toyonaka, Osaka 5600043, Japan

[6] Japan Atom Energy Res Inst, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[7] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[8] Kobe Univ, Grad Sch Sci, Kobe, Hyogo 6578501, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2013年 / 82卷 / 10期

关键词：

EuGa4; EuAl4; SrGa4; antiferromagnet; dHvA; Fermi surface; CDW; GD;

D O I：

10.7566/JPSJ.82.104703

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 vertical bar vertical bar [100] and [001] in the antiferromagnetic state, where the antiferromagnetic easy-axis is oriented along the [100] direction below a Neel temperature T-N = 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 T-CDW = 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.

引用

页数：10

共 14 条

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