TY - JOUR
T1 - Magnetic and superconducting properties of CeRhGe2 and CePtSi2
AU - Hirose, Yusuke
AU - Nishimura, Naoto
AU - Honda, Fuminori
AU - Sugiyama, Kiyohiro
AU - Hagiwara, Masayuki
AU - Kindo, Koichi
AU - Takeuchi, Tetsuya
AU - Yamamoto, Etsuji
AU - Haga, Yoshinori
AU - Matsuura, Masato
AU - Hirota, Kazuma
AU - Yasui, Akira
AU - Yamagami, Hiroshi
AU - Settai, Rikio
AU - Onuki, Yoshichika
PY - 2011/2
Y1 - 2011/2
N2 - We synthesized a new compound of CeRhGe2 with the orthorhombic CeNiSi2-type structure. By measuring the electrical resistivity, magnetic susceptibility, magnetization, specific heat, and neutron scattering for single crystals, CeRhGe2 was found to order antiferromagnetically below TN = 7.6 K with an ordered moment of 1.3 μB/Ce oriented along the magnetic easy-axis of the c-axis. Similar measurements were also carried out for CePtSi2 single crystals. From the experimental results of anisotropic magnetic susceptibility and magnetization, the crystalline electric field (CEF) scheme was obtained for CeRhGe2 and CePtSi2, together with the similar compound CeNiGe2. Furthermore, we carried out pressure experiments by measuring the electrical resistivity of CePtSi2 and CeRhGe2. In the quantum critical region where the Néel temperature becomes zero, we observed superconductivity in CePtSi2 and most likely CeRhGe2, at 1.5 and 7.1 GPa, respectively. The upper critical field of CePtSi2 was found to be highly anisotropic with respect to the three principal field directions.
AB - We synthesized a new compound of CeRhGe2 with the orthorhombic CeNiSi2-type structure. By measuring the electrical resistivity, magnetic susceptibility, magnetization, specific heat, and neutron scattering for single crystals, CeRhGe2 was found to order antiferromagnetically below TN = 7.6 K with an ordered moment of 1.3 μB/Ce oriented along the magnetic easy-axis of the c-axis. Similar measurements were also carried out for CePtSi2 single crystals. From the experimental results of anisotropic magnetic susceptibility and magnetization, the crystalline electric field (CEF) scheme was obtained for CeRhGe2 and CePtSi2, together with the similar compound CeNiGe2. Furthermore, we carried out pressure experiments by measuring the electrical resistivity of CePtSi2 and CeRhGe2. In the quantum critical region where the Néel temperature becomes zero, we observed superconductivity in CePtSi2 and most likely CeRhGe2, at 1.5 and 7.1 GPa, respectively. The upper critical field of CePtSi2 was found to be highly anisotropic with respect to the three principal field directions.
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U2 - 10.1143/JPSJ.80.024711
DO - 10.1143/JPSJ.80.024711
M3 - Article
AN - SCOPUS:79951637606
SN - 0031-9015
VL - 80
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 2
M1 - 024711
ER -