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首页> 外文期刊>Physica, B. Condensed Matter >Non-Fermi-liquid behavior in UCu_(4x)Al_(8-x) compounds
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Non-Fermi-liquid behavior in UCu_(4x)Al_(8-x) compounds

机译：UCu_（4x）Al_（8-x）化合物中的非费米液体行为

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We report on experimental studies of the Kondo physics and the development of non-Fermi-liquid scaling in UCu_(4x)Al_(8-x) family. We studied 7 different compounds with compositions between x=0 and 2. We measured electrical transport (down to 65 mK) and thermoelectric power (down to 1.8 K) as a function of temperature, hydrostatic pressure, and/or magnetic field. Compounds with Cu content below x=1.25 exhibit long-range antiferromagnetic order at low temperatures. Magnetic order is suppressed with increasing Cu content and our data indicate a possible quantum critical point at x _(cr)≈1.15. For compounds with higher Cu content, non-Fermi-liquid behavior is observed. Non-Fermi-liquid scaling is inferred from electrical resistivity results for the x=1.25 and 1.5 compounds. For compounds with even higher Cu content, a sharp kink occurs in the resistivity data at low temperatures, and this may be indicative of another quantum critical point that occurs at higher Cu compositions. For the magnetically ordered compounds, hydrostatic pressure is found to increase the Néel temperature, which can be understood in terms of the Kondo physics. For the non-magnetic compounds, application of a magnetic field promotes a tendency toward Fermi-liquid behavior. Thermoelectric power was analyzed using a two-band Lorentzian model, and the results indicate one fairly narrow band (10 meV and below) and a second broad band (around hundred meV). The results imply that there are two relevant energy scales that need to be considered for the physics in this family of compounds.
机译：我们报告了近藤物理学的实验研究以及UCu_（4x）Al_（8-x）系列中非费米液体结垢的发展。我们研究了7种不同的化合物，其组成在x = 0和2之间。我们测量了电传输（低至65 mK）和热电功率（低至1.8 K）随温度，静水压力和/或磁场的变化。 Cu含量低于x = 1.25的化合物在低温下表现出长距离的反铁磁序。随着Cu含量的增加，磁序被抑制，我们的数据表明在x _（cr）≈1.15处可能存在量子临界点。对于具有较高Cu含量的化合物，观察到非费米液体行为。从x = 1.25和1.5化合物的电阻率结果可以推断出非费米液体结垢。对于具有更高Cu含量的化合物，在低温下的电阻率数据中会出现明显的扭结，这可能表明在更高Cu组成下会出现另一个量子临界点。对于磁性有序化合物，发现静水压力会增加Néel温度，这可以根据近藤物理学来理解。对于非磁性化合物，施加磁场促进了费米-液体行为的趋势。使用两频带洛伦兹模型分析热电功率，结果表明一个相当窄的频带（10 meV及以下）和第二个较宽的频带（约100 meV）。结果表明，在该化合物家族中，物理学需要考虑两个相关的能级。

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