A specific-heat study of RMn4Al8 compounds (R=Y, La, Pr, Nd, Dy, Er)
A specific-heat study of RMn4Al8 compounds (R=Y, La, Pr, Nd, Dy, Er)
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RMn4Al8 化合物（R=Y、La、Pr、Nd、Dy、Er）的比热研究
DOI：
10.1016/s0925-8388(99)00595-2
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发表时间：
2000
影响因子：
6.2
通讯作者：
K. Buschow
中科院分区：
文献类型：
--
作者：
I. Hagmusa;J. Klaasse;E. Brück;F. D. Boer;K. Buschow
在1.5 ~ 200 K温度范围内对四元ThMn_（12）型RMn_4Al_8化合物（R=Y，La，Pr，Nd，Dy和Er）进行了比热测量。PrMn_4Al_8在14 K时产生λ型反常。在1.5K以上的比热曲线中没有发现指示磁有序的异常的RMn 4Al 8化合物，R=Y，La，Nd，Dy，和Er。从磁熵的温度依赖性，它的结论是，在与R=Pr，Nd，Dy，和Er的化合物的整体晶场分裂是200 K或更少的顺序。
Specific-heat measurements have been performed on the tetragonal ThMn12-type RMn4Al8compounds with R=Y, La, Pr, Nd, Dy and Er in the temperature range 1.5 to 200 K. The compound PrMn4Al8gives rise to a λ-type anomaly at 14 K. No anomalies indicative of magnetic ordering were found above 1.5 K in the specific-heat curves of the RMn4Al8compounds with R=Y, La, Nd, Dy, and Er. From the temperature dependence of the magnetic entropy, it is concluded that the overall crystal-field splitting in the compounds with R=Pr, Nd, Dy, and Er is of the order of 200 K or even less.