RFeAsO（R=La，Ce，Pr，Sm，Gd）的热膨胀
Thermal expansion of RFeAsO (R=La,Ce,Pr,Sm,Gd)
摘要：
测量了多晶RFeAsO（R = La，Ce，Pr，Sm，Gd）的热膨胀系数$α$。磁有序转变处的异常表明$T_{\rm N}$具有显著的磁弹性耦合和负压力依赖性。结构转变与$α$中的大异常有关。稀土磁有序CeFeAsO，PrFeAsO和SmFeAsO在低温下产生大的正异常。
英文摘要：
We present measurements of the thermal expansion coefficient $α$ of polycrystalline RFeAsO (R = La,Ce,Pr,Sm,Gd). Anomalies at the magnetic ordering transitions indicate a significant magneto-elastic coupling and a negative pressure dependence of $T_{\rm N}$ . The structural transitions are associated by large anomalies in $α$. Rare earth magnetic ordering in CeFeAsO, PrFeAsO, and SmFeAsO yields large positive anomalies at low temperatures.
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