Anisotropic Magnetic Properties of a Pressure-induced Superconductor Ce_2Ni_3Ge_5(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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Single crystals of a pressure-induced superconductor Ce_2Ni_3Ge_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>=5.0K and T_<N2>=4.3K. The electronic specific heat coefficient obtained from the low-temperature specific heat data amounts to 90mJ/K^2・mol Ce. The high-field magnetization for H ‖[100] shows four magnetic transitions at 11.8, 12.9, 17.5 and 23.9T with a saturation moment of 0.73μ_B/Ce at 1.3K. On the other hand, two magnetic transitions are observed for H ‖[010] and [001], with saturation moments of 0.43 and 1.1μ_B/Ce, respectively. 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 576K, respectively.
社団法人日本物理学会の論文
2005-10-15