Thermal expansion of RFeAsO (R=La,Ce,Pr,Sm,Gd)

Details Thermal expansion of RFeAsO (R=La,Ce,Pr,Sm,Gd) Thermal expansion of RFeAsO (R=La,Ce,Pr,Sm,Gd)

2009-09-22

arxiv.org/abs/0909.3998v1

Physics

Condensed Matter

Superconductivity

accepted

Scientific paper

We present measurements of the thermal expansion coefficient $\alpha$ 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 $\alpha$. Rare earth magnetic ordering in CeFeAsO, PrFeAsO, and SmFeAsO yields large positive anomalies at low temperatures.

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