Thermal expansion of RFeAsO (R=La,Ce,Pr,Sm,Gd)
| Autor: | Klingeler, R., Wang, L., Kohler, U., Behr, G., Hess, C., Buchner, B. |
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| Rok vydání: | 2009 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1742-6596/200/1/012088 |
| Popis: | 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. Comment: accepted |
| Databáze: | arXiv |
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