Precize measurements of the transport propenties of f-electron ststem at low temperatures

系统地研究了低至He^3温度区域的f电子化合物的霍尔系数（R_H）和热电功率(S)。还进行了使用稀释冰箱的低温测量。特别强调了在f-电子领域中表现出非费米液体异常的材料，这些材料一直是当前感兴趣的系统。为了获得可靠的结果，我们从每个系统的高质量晶体生长开始。与R_H和S相比，我们还测量了R_H的电阻率(P)、比热和磁化率。y_ <0.8>U_<0.2>Pd_3: R_H随温度的降低呈线性增加，这与普通磁系相比有些奇怪。然而，如果我们考虑到浓度接近于0 k -弹玻璃跃迁，这可以理解为由于反常霍尔效应。高温下的CeNi_2Ge_2: R_H可以解释为普通的斜散射，而低温下的R_H则不符合费米液体理论预测的R_H * P^2的关系。在较宽的温度范围内，它遵循R_H * ln(p)。然而，在这个阶段，我们不能断定R_H中与FL预测的偏差与其他性质中的非FL行为直接相关。Y_<1-x>U_xRu_2Si_2, Th_<1-x>U_xRu_2Si_2：这些体系是最有可能的候选体系，表现出源于双通道近藤效应的异常。异常行为出现在特征温度（T_c）以下。R_H也被发现在T_c以下表现出异常的减少，这很难用普通的异常霍尔效应来解释。我们还发现S在T_c以下急剧下降，并在较低温度下呈现深最小值。CeFe_2Ge_2：我们发现CeFe_2Ge_2是一种新的重费米子超磁体，具有异常输运性质，表明其非fl行为与自旋涨落有关。

The Hall coefficient (R_H) and thermoelectric power (S) have been systematically investigated on f-electron compounds down to the He^3 temperature region. The lower temperature measurements using a dilution refrigerator have been also proceeded. Special emphasis were put on the materials exhibiting non-Fermi liquid anomalies which have been the systems of current interest in the field of f-electrons. In order to obtain reliable results, we have started from the high quality crystal growth for each system. For comparison with R_H and S, we also measured the resistivity (P), specific heat, and magnetic susceptibility.Y_<0.8>U_<0.2>Pd_3 : R_H shows a linear increase with decreasing temperature, which is slight1y strange as an ordinary magnetic systems. It can be understood, however, as due to the anomalous Hall effect, if we take into account the closeness of the concentration to the 0 K-spinglass transition.CeNi_2Ge_2 : R_H at high temperatures could be explained as due to the ordinary skew scattering, while R_H at low temperatures does not follow the relation, R_H * P^2, predicted from the Fermi liquid (FL) theory. It rather follows R_H * ln(p) in a wide temperature range. At this stage, however, we cannot conclude that the deviation from the FL prediction in R_H is directly related with the non-FL behaviors in the other properties.Y_<1-x>U_xRu_2Si_2, Th_<1-x>U_xRu_2Si_2 : These systems were the most probable candidates exhibiting anomalies originating from the two channel Kondo effect. Anomalous behaviors appear below a characteristic temperature (T_c). R_H was also found to exhibit an anomalous decrease below T_c, which is hardly explainable within the ordinary anomalous Hall effect. We also found S sharply decreases below T_c and shows a deep minimum at lower temperatures.CeFe_2Ge_2 : We found CeFe_2Ge_2 to be a new heavy Fermion metamagnet which shows anomalous transport properties, suggesting the non-FL behavior related with the spin fluctuation.