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Journal Articles

Magnetic and Fermi surface properties in ferromagnets NdRh$$_3$$B$$_2$$ and GdRh$$_3$$B$$_2$$

Obiraki, Yoshiko*; Nakashima, Hiroshi*; Galatanu, A.*; Matsuda, Tatsuma; Haga, Yoshinori; Takeuchi, Tetsuya*; Sugiyama, Kiyohiro*; Kindo, Koichi*; Hagiwara, Masayuki*; Settai, Rikio*; et al.

Journal of the Physical Society of Japan, 75(6), p.064702_1 - 064702_8, 2006/06

https://doi.org/10.1143/JPSJ.75.064702
 Times Cited Count：4 Percentile：31.65(Physics, Multidisciplinary)

We succeeded in growing single crystals of ferromagnets NdRh$$_3$$B$$_2$$ and GdRh$$_3$$B$$_2$$ with the hexagonal structure, and measured the electrical resistivity, specific heat, magnetic susceptibility and magnetization. From these measurements, the Curie temperature $$T_C$$ is determined as $$T_C$$=10.2 K in NdRh$$_3$$B$$_2$$ and TC=93 K in GdRh$$_3$$B$$_2$$. The magnetic moments of about 2.5 $$mu_B$$ in NdRh$$_3$$B$$_2$$ and 7.7 $$mu_B$$ in GdRh$$_3$$B$$_2$$ are oriented in the basal plane. The crystalline electric field scheme is proposed for NdRh$$_3$$B$$_2$$ on the basis of the experimental results of Schottky anomaly in the specific heat and anisotropic susceptibility and magnetization. The Fermi surface in NdRh$$_3$$B$$_2$$ is very similar to that in a non-4 f reference compound LaRh$$_3$$B$$_2$$, possessing the quasi-one dimensional electronic character.

Journal Articles

Anisotropic magnetic properties of Ce$$_2$$Ni$$_3$$Ge$$_5$$ single crystal

Thamizhavel, A.*; Sugitani, Ichiro*; Obiraki, Yoshiko*; Nakashima, Miho*; Okuda, Yusuke*; Matsuda, Tatsuma; Haga, Yoshinori; Takeuchi, Tetsuya*; Sugiyama, Kiyohiro*; Settai, Rikio*; et al.

Physica B; Condensed Matter, 378-380, p.841 - 842, 2006/05

https://doi.org/10.1016/j.physb.2006.01.483
 Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)

We have succeeded in growing single crystals of Ce$$_2$$Ni$$_3$$Ge$$_5$$, which crystallizes in the orthorhombic crystal structure, by the flux method and studied the anisotropic physical properties by measuring the electrical resistivity, magnetic susceptibility and specific heat. The results of these measurements indicate that Ce$$_2$$Ni$$_3$$Ge$$_5$$ undergoes two antiferromagnetic transitions at $$T_{N1}$$=4.9 K and $$T_{N2}$$=4.3 K. The electrical resistivity and susceptibility measurements reveal strong anisotropic magnetic properties. From the specific heat measurement the electronic specific heat coefficient was found to be 90mJ/K$$^2$$mol.

Journal Articles

Anisotropic magnetic properties of a pressure-induced superconductor Ce$$_2$$Ni$$_3$$Ge$$_5$$

Thamizhavel, A.*; Nakashima, Hiroshi*; Obiraki, Yoshiko*; Nakashima, Miho*; Matsuda, Tatsuma; Haga, Yoshinori; Sugiyama, Kiyohiro*; Takeuchi, Tetsuya*; Settai, Rikio*; Hagiwara, Masayuki*; et al.

Journal of the Physical Society of Japan, 74(10), p.2843 - 2848, 2005/10

https://doi.org/10.1143/JPSJ.74.2843
 Times Cited Count：15 Percentile：61.77(Physics, Multidisciplinary)

Single crystals of a pressure-induced superconductor Ce$$_2$$Ni$$_3$$Ge$$_5$$ have been successfully grown by the flux method. The anisotropic magnetic properties due to the orthorhombic crystal structure have been studied precisely by the electrical resistivity, specific heat, magnetic susceptibility, and high-field magnetization measurements. The results of these measurements confirmed two antiferromagnetic transitions at T$$_{N1}$$=5.0 K and T$$_{N2}$$=4.3 K. The electronic specific heat coefficient obtained from the low-temperature specific heat data amounts to 90 mJ/K$$^2$$mol Ce. The high-field magnetization for H //[100] shows four magnetic transitions at 11.8, 12.9, 17.5 and 23.9 T with a saturation moment of 0.73 $$mu_B$$/Ce at 1.3 K. We have also performed the crystalline electric field (CEF) analysis on the magnetic susceptibility and magnetization to understand the magnetocrystalline anisotropy, where the splitting energies of two excited doublets in the CEF scheme are estimated to be 140 and 576 K, respectively.

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