Abstract
We have measured the magnetic susceptibility χ, specific heat Cp and resisitivity ρ on sputtered structure-disordered Ce80−yLayRu20 alloys. The χ for y ≤ 70 follows the Curie-Weiss law in the measurement temperature region. The paramagnetic effective magnetic moment peff is about 1.8 μB/Ce-atom for y = 0 and decreases with increasing the La-concentration (0.6 μB/Ce-atom for y = 70). The Cp follows linear relation of temperature above 7 K for all the samples. The specific heat coefficient γ shows about 200 mJ/molK2 for y = 0 and decreases rapidly with increasing La-concentration. We found the -log T dependence of the ρ in the La-substituted samples. Magnitude and temperature range of the -log T contribution to the whole resistivity increase with increasing the La concentration. On the other hand, we have observed superconducting behaviors of the resistivity ρ = 0 and a large diamagnetization at low temperature (T < 3 K) for y = 80.
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