Magnetic and transport properties of a new orthorhombic compound Ce 3 NbRh 4 Ge 4 have been investigated by the magnetization, the electrical resistivity, the ac magnetic susceptibility and the specific-heat measurements. Ce 3 NbRh 4 Ge 4 is a Kondo-lattice compound with the trivalent Ce ions at high temperatures and exhibits ferromagnetic or ferrimagnetic transition at T C = 1.8 K. The small magnetization value at 1.8 K (0.18 B /Ce at 5 T), the small entropy at T C (0.2Rln2), and the large electronic specific-heat coefficient (0.131~0.163 J/Ce-mol K 2) are presumably due to the vicinity of a quantum critical point.
We measured the low-temperature specific heat Cp, resistivity ρ, and magnetoresistance Δρ(H)/ρ(0) for amorphous Ce50Al50 synthesized by a DC high-rate sputter method. The low-temperature Cp (T < 2 K) decreases rapidly toward 0 K and has no indication of phase transition. The value of γ0 which is extrapolated down to 0 K of the Cp/T is 117 mJ/molK2. The temperature dependence of ρ increases with decreasing temperature down to 0.6 K. We found that both a weak localization effect and a coherent Kondo state might be realized in the low-temperature region for the present alloy from the conductivity analysis. Furthermore, in the low-temperature ρ, a T2 term with a very large coefficient A was observed. The ratio of A/γ02 is 0.63 ×10-5 (μΩcm/K2)/(mJ/molK2)2 and is near the value of typical Ce-based heavy-fermion compounds. The magnetoresistances Δρ(H)/ρ(0) at 0.5 K and 2 K are almost constant in the magnetic field region of H < 10 kOe. We considered that the negative magnetoresistance effect is due to the weak localization and the positive magnetoresistance to the heavy-fermion state in the present alloy.
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