The dilute limit of heavy fermions: evidence of the coherent nature of CeAl3
The dilute limit of heavy fermions: evidence of the coherent nature of CeAl3
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重费米子的稀释极限：CeAl3 相干性质的证据
DOI：
10.1088/0953-8984/21/49/495601
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
H. Tsujii
中科院分区：
文献类型：
--
作者：
B. Andraka;C. Rotundu;Y. Takano;H. Tsujii
用低温比热研究了强稀释CexLa1−xAl3合金，以阐明决定其基态的机制。对于Ce含量为0.0005≤x≤0.1时的合金，计算结果符合S=1/2的近藤行为。然而，只有在x=0.01以下才能观察到单离子标度。真正的单离子近藤温度很小，仅为0.2K，与稀释CeAl2的温度大致相同。它比CeAl3的小约20倍，表明CeAl3的共格性质。即使在高达5K的温度下，单离子对CeAl3热力学性质的贡献也是微不足道的。
Strongly diluted CexLa1−xAl3 alloys have been studied by the low temperature specific heat in order to elucidate the mechanism that determines their ground state. The results for alloys with Ce concentrations of 0.0005≤x≤0.1 are fairly consistent with a S = 1/2 Kondo behavior. However, the single-ion scaling is observed only below x = 0.01. The true single-ion Kondo temperature is small, 0.2 K, approximately equal to that for dilute CeAl2. It is about 20 times smaller than that for CeAl3, indicating the coherent nature of CeAl3. The single-ion contribution to thermodynamic properties of CeAl3 is negligible even at temperatures as high as 5 K.