Lattice anomalies in the FeAs$_{\rm 4}$ tetrahedra of the NdFeAsO$_{\rm 0.85}$ superconductor that disappear at T$_{\rm c}$
| Autor: | Calamiotou, M., Margiolaki, I., Gantis, A., Siranidi, E., Ren, Z. A., Zhao, Z. X., Liarokapis, E. |
|---|---|
| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | EPL 91, 57005 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1209/0295-5075/91/57005 |
| Popis: | High resolution synchrotron X-ray powder diffraction (SXRPD) was used to study the temperature dependence of the oxygen deficient NdFeAsO$_{0.85}$ superconducting compound. By employing a dense temperature sampling we have managed to reveal unnoticed structural modifications that start around $\sim$180K, and disappear at the transition temperature. The data show minor changes of the structural characteristics in the Nd-O charge reservoir layer while in the superconducting Fe-As layer the FeAs$_{4}$ tetrahedron shows gradual modifications below $\sim$180K, which suddenly disappear at T$_{\rm c}$ strongly indicating a connection with superconductivity. Comment: 4 pages, 1 table, 5 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|