On the pressure-temperature phase diagram of the Kondo compound CeAl 2
On the pressure-temperature phase diagram of the Kondo compound CeAl 2
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近藤化合物CeAl 2 的压力-温度相图
DOI：
10.1051/jphys:01987004804063500
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
S. Zemirli
中科院分区：
文献类型：
--
作者：
B. Barbara;J. Beille;B. Cheaito;J. Laurant;M. Rossignol;A. Waintal;S. Zemirli
对CeAl2粉状单晶进行了精确的高压X射线衍射实验，在150kbar以下没有发现任何大的体积反常。然而，对同一批次的单晶进行的高压电阻实验表明，在室温下，在80kbar附近有一个连续的反常，即接近Croft和Jayaraman[2]观察到的强烈体积反常的压力。电阻反常一直持续到2K，在CeAl2的P-T图上出现了一条新的线。这条线被解释为两个不同的近藤政权之间的交叉，跨越了发生磁秩序的临界线。基于我们在CeAl2中的结果，提出并讨论了磁有序Kondo化合物的详细相图。
Accurate high pressure X-ray diffraction experiments performed on a powdered single crystal of CeAl2 do not show any sizeable volume anomaly up to 150 kbar. However, high pressure electrical resistance experiments performed on a single crystal of the same batch show a continuous anomaly near 80 kbar at room temperature, i.e. close to the pressure for which Croft and Jayaraman [2] observed a strong volume anomaly. The resistance anomaly has been followed down to 2 K leading to a new line in the P-T diagram of CeAl2. This line, interpreted in terms of a crossover between two different Kondo regimes, crosses the critical line where magnetic order takes place. On the basis of our results in CeAl2, a detailed phase diagram for magnetically ordered Kondo compounds is proposed and discussed.