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High pressure effects on the electrical resist ivity behavior of the Kondo lattice, YbPd2Si2

机译：高压对近藤晶格YbPd2Si2的电阻率行为的影响

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We report the influence of external high-pressure (P up to 8 GPa) on the temperature (T) dependence of electrical resistivity (rho) of a Yb-based Kondo lattice, YbPd2Si2, which does not undergo magnetic ordering under ambient pressure condition. There are qualitative changes in the rho(T) behavior due to the application of external pressure. While rho is found to vary quadratically below 15 K (down to 45 mK) characteristic of Fermi-liquids, a drop is observed below 0.5 K for P = 1 GPa, signaling the onset of magnetic ordering of Yb ions with the application of P. The Tat which this fall occurs goes through a peak as a function of P (8 K for P = 2 GPa and about 5 K at high pressures), mimicking Doniach's magnetic phase diagram. We infer that this compound is one of the very few Yb-based stoichiometric materials, in which one can traverse from valence fluctuation to magnetic ordering by the application of external pressure. (C) 2004 Elsevier Ltd. All rights reserved.
机译：我们报告了外部高压（高达8 GPa的压力）对基于Yb的近藤晶格YbPd2Si2的电阻率（rho）的温度（T）依赖性的影响，该晶格在环境压力条件下不会发生磁性排序。由于施加外部压力，rho（T）行为有质的变化。虽然发现铑在费米液体的特征值低于15 K（下降至45 mK）时呈二次方变化，但对于P = 1 GPa，观察到低于0.5 K的下降，这表明施加P后开始Yb离子的磁有序化。发生这种下降的Tat随P的变化经历一个峰值（P = 2 GPa时为8 K，高压下约为5 K），与Doniach的磁相图相似。我们推断该化合物是极少数基于Yb的化学计量材料之一，其中可以通过施加外部压力从价态波动转变为磁有序。 （C）2004 Elsevier Ltd.保留所有权利。

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