Transport and magnetic properties of EuAl4 and EuGa4

Ai Nakamura, Taro Uejo, Fuminori Honda, Tetsuya Takeuchi, Hisatomo Harima, Etsuji Yamamoto, Yoshinori Haga, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Masato Hedo, Takao Nakama, Yoshichika O'Nuki

研究成果: ジャーナルへの寄稿学術誌査読

18 被引用数 (Scopus)

抄録

We succeeded in growing a single crystal of the Eu-divalent compound EuAl4 with the BaAl4-type tetragonal structure by the Al self-flux method and measured the electrical resistivity, magnetic susceptibility, magnetization, specific heat, and thermoelectric power. EuAl4 orders antiferromagnetically below TN1 = 15.4 K, with three successive antiferromagnetic transitions at TN2 = 13.2 K, TN3 = 12.2 K, and TN4 = 10.0 K. The latter two transitions are of the first-order. The corresponding magnetization curve indicates three successive metamagnetic transitions with hystereses and saturates above 16 kOe. We observed a plausible characteristic feature of the charge density wave (CDW) below TCDW = 140 K. We also studied an effect of pressure on the electronic state by measuring the electrical resistivity and thermoelectric power. TCDW is found to decrease with increasing pressure at a rate of dTCDW/dP = -54.7K/GPa and becomes zero at about 2.5 GPa. The present antiferromagnetic ordering is, however, found to be stable at higher pressures up to 7 GPa in EuAl4. On the other hand, the different characteristic CDW was observed in EuGa4, not at ambient pressure but above 1 GPa, and TCDW increases with increasing pressure. Above 6 GPa, we found that the antiferromagnetic ordering is changed into another first-order-like phase transition. Its characteristic feature is similar to that of the valence transition, and the heavy fermion state is realized at low temperatures.

本文言語英語
論文番号e124711
ジャーナルjournal of the physical society of japan
84
12
DOI
出版ステータス出版済み - 12月 15 2015
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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