首页> 外文期刊>Zeitschrift fur Physik, B. Condensed Matter >Pressure-induced magnetically ordered Kondo lattice state in YbCu_2Si_2
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Pressure-induced magnetically ordered Kondo lattice state in YbCu_2Si_2

机译:YbCu_2Si_2中压力感应的磁有序近藤晶格状态

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摘要

The effect of pressure on the electrical resistivity ρ(T) of several YbCu_2Si_2 samples was investigated up to 25 GPa and for 30 mK < T < 300 K. With increasing pressure the compound crosses from an intermediate valence state to a magnetic Kondo lattice state at a critical pressure P_C ~ 8 GPa. Below P_C, i.e. in the non-magnetic phase, ρ = ρ_0 + AT~2 is found at very low temperature, indicating the validity of the Fermi liquid description. On approaching the magnetic instability, the A coefficient and the residual resistivity ρ_0 increase strongly. Close to P_C, ρ_0 shows a pronounced maximum due to scattering by lattice defects. The pressure variation of the magnetic resistivity ρ_(mag) at high temperature is interpreted in the terms of a pressure induced change of the crystal field splitting.
机译:在高达25 GPa和30 mK

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