Single Uranium-Site Properties of the Dilute Heavy Electron System UxTh1-xRu2Si2 (x≤0.07)
Single Uranium-Site Properties of the Dilute Heavy Electron System UxTh1-xRu2Si2 (x≤0.07)
复制标题
稀重电子体系UxTh1-xRu2Si2 (x≤0.07)的单铀位点性质
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
T. Sakakibara
中科院分区：
文献类型：
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作者：
H. Amitsuka;T. Sakakibara
在100 mK≤ T ≤360 K温度范围内和磁场H达55 kOe的条件下，测量了稀四重电子化合物UxTh 1-xRu 2Si 2（x ≤0.07）的比热C、电阻率ρ、磁化强度M和磁化率χ.在低温下观察到C、ρ和χ与lnT的非费米液体行为：当温度降低到10 K以下时，C / T和χ随温度升高而增大，ρ随温度降低而减小。这些量与铀浓度的系统变化表明，所观察到的非费米液体的行为归因于一个单一的U离子嵌入在Th网站的ThRu 2Si 2金属的属性。磁化强度曲线M与H / T的关系表明，U离子的5 f矩沿四极轴沿着具有很强的单轴磁各向异性.根据最近发展的S =1/2双通道Kondo模型给出了一种可能的解释。
Specific heat C , electrical resistivity ρ , magnetization M and magnetic susceptibility χ have been measured for the dilute tetragonal heavy-electron compounds U x Th 1- x Ru 2 Si 2 ( x ≤0.07), in the temperature range 100 mK≤ T ≤360 K and in the magnetic fields H up to 55 kOe. Non-Fermi-liquid behavior with unusual lnT dependence of C , ρ and χ has been observed at the low temperatures: as the temperature is lowered below about 10 K, C / T and χ increase logarithmically, and ρ decreases logarithmically. Systematical variations of these quantities with uranium concentration indicate that the observed non-Fermi-liquid behavior is ascribed to the properties of a single U ion embedded in the Th site of the ThRu 2 Si 2 metal. The magnetization curves M vs H / T indicate a strong uniaxial magnetic anisotropy along the tetragonal c -axis as well as a strong reduction of the 5 f moment of U ions. A possible interpretation based on the recent developments of the S =1/2 two-channel Kondo model is given.