Pietri R, Ingersent K, Andraka B
Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440, USA.
Phys Rev Lett. 2001 Feb 5;86(6):1090-3. doi: 10.1103/PhysRevLett.86.1090.
The specific heat C of Ce0.8La0.2Al3 has been measured as a function of temperature T in magnetic fields up to 14 T. A large peak in C at 2.3 K has recently been ascribed to an anisotropic Kondo effect in this compound. A 14-T field depresses the temperature of the peak by only 0.2 K, but strongly reduces its height. The corresponding peak in C/T shifts from 2.1 K at zero field to 1.7 K at 14 T. The extrapolated specific heat coefficient gamma = lim as T --> 0 of C/T increases with field over the range studied. We show that these trends are inconsistent with the anisotropic Kondo model.
已测量了Ce0.8La0.2Al3的比热C随温度T的变化关系，测量是在高达14 T的磁场中进行的。最近，该化合物在2.3 K时比热出现的一个大峰值被归因于各向异性的近藤效应。14 T的磁场仅使峰值温度降低了0.2 K，但却极大地降低了其高度。C/T对应的峰值从零场下的2.1 K移至14 T时的1.7 K。在所研究的磁场范围内，外推得到的比热系数γ = 当T趋近于0时C/T的极限值随磁场增加。我们表明，这些趋势与各向异性近藤模型不一致。
