Abstract
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.
Highlights
Research on the physical properties of strongly correlated electron systems has been conducted on high-quality single crystal samples and on disordered systems
The low-temperature transport properties of Ce–Al bulk-metallic glasses synthesized by single-roller melt spinning were investigated by Zeng et al.[1]. They have indicated that the competition between the Kondo effect and the Ruderman–Kittel–Kasuya–Yoshida (RKKY) interaction is caused by the variation in the Ce concentration or the magnetic field
As we have found the large γ0 from the specific heat, the -log T dependence of ρ suggests the formation of a dense Kondo state at the low-temperature a-Ce50Al50
Summary
Research on the physical properties of strongly correlated electron systems has been conducted on high-quality single crystal samples and on disordered systems (quasicrystals, amorphous). A Ce–Al bulk-metallic glass is a typical example. The low-temperature transport properties of Ce–Al bulk-metallic glasses synthesized by single-roller melt spinning were investigated by Zeng et al.[1] They have indicated that the competition between the Kondo effect and the Ruderman–Kittel–Kasuya–Yoshida (RKKY) interaction is caused by the variation in the Ce concentration or the magnetic field. CeAl bulk-metallic glasses have various characteristics such as interaction change with Ce concentration, localization or delocalization of 4f -electrons, and magnetic transition by a new metastable phase
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