Thermoelectric Power at Low Temperatures in Ce(Ni1-xPdx)2Ge2 and CeCu5.9Au0.1 in the Vicinity of Antiferromagnetic Quantum Critical Point
Thermoelectric Power at Low Temperatures in Ce(Ni1-xPdx)2Ge2 and CeCu5.9Au0.1 in the Vicinity of Antiferromagnetic Quantum Critical Point
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DOI：
10.1143/jpsjs.80sa.sa064
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发表时间：
2011-07-01
影响因子：
1.7
通讯作者：
Fukuhara, Tadashi
中科院分区：
文献类型：
--
作者：
Kuwai, Tomohiko;Iwaki, Toru;Fukuhara, Tadashi
本文给出了Ce（Ni_（1-x）Pdx）（2）Ge_（2-x）（x = 0，近似于0.12）和CeCu_（5.9）Au_（0.1）在0.2K以下的热电势S和磁比热C_m的实验结果，它们位于反铁磁量子临界点（AFM-QCP）附近。Ce（Ni_（1-x）Pdx）（2）Ge_（2-）的S/T随温度的降低而单调增加，而S/T随温度的变化关系复杂。的相关参数q，相当于比S/C-m，降低到10 K以下达到一个相当小的值比统一在最低温度为CeNi 2Ge 2。另一方面，CeCu5.9Au0.1的q从1 K附近的饱和向上偏离低于0.6K，并在最低温度下达到1。低温下两个系统q值的对比观察似乎反映了AFM-QCP类型的差异。
We present experimental results of thermoelectric power S and magnetic specific heat C-m down to 0.2 K for Ce(Ni1-xPdx)(2)Ge-2 (x = 0 similar to 0.12) and CeCu5.9Au0.1, being located in the vicinity of antiferro-magnetic quantum critical point (AFM-QCP). S/T for Ce(Ni1-xPdx)(2)Ge-2 shows complicated temperature dependence in contrast to a monotonic increase in the C-m/T with decreasing temperatures. The correlation parameter q, equivalent to the ratio S/C-m, decreases below 10 K attaining a considerably smaller value than unity at the lowest temperature for CeNi2Ge2. On the other hand, the q for CeCu5.9Au0.1 deviates upward below 0.6 K from the saturation around 1 K, and reaches unity at the lowest temperature. The contrastive observation in the q between the both systems at low temperatures seems to reflect the difference in the AFM-QCP type.