TY - JOUR
T1 - Magnetic and fermi surface properties of EuGa4
AU - Nakamura, Ai
AU - Hiranaka, Yuichi
AU - Hedo, Masato
AU - Nakama, Takao
AU - Miura, Yasunao
AU - Tsutsumi, Hiroki
AU - Mori, Akinobu
AU - Ishida, Kazuhiro
AU - Mitamura, Katsuya
AU - Hirose, Yusuke
AU - Sugiyama, Kiyohiro
AU - Honda, Fuminori
AU - Settai, Rikio
AU - Takeuchi, Tetsuya
AU - Hagiwara, Masayuki
AU - Matsuda, Tatsuma D.
AU - Yamamoto, Etsuji
AU - Haga, Yoshinori
AU - Matsubayashi, Kazuyuki
AU - Uwatoko, Yoshiya
AU - Harima, Hisatomo
AU - Onuki, Yoshichika
PY - 2013/10
Y1 - 2013/10
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84884997489&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84884997489&partnerID=8YFLogxK
U2 - 10.7566/JPSJ.82.104703
DO - 10.7566/JPSJ.82.104703
M3 - Article
AN - SCOPUS:84884997489
VL - 82
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 10
M1 - 104703
ER -