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

Abstract

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 $T_{\mathrm{N}}$ . 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.

accepted

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Cited by in corpus (5)

• Structural and magnetic transition in CeFeAsO: separated or connected?
• Tetragonal to Orthorhombic Transition of GdFeAsO Studied by Single-Crystal Synchrotron X-Ray Diffraction
• Pr magnetism and its interplay with the Fe spin density wave in PrFeAsO
• Revisiting the phase diagram of LaFe${}_{1-x}$Co${}_x$AsO on single crystals by thermodynamic methods
• Evidence for negative thermal expansion in the superconducting precursor phase SmFeAsO