Lattice anomalies in the FeAs tetrahedra of the NdFeAsO superconductor that disappear at T
arXiv:1004.1340 · doi:10.1209/0295-5075/91/57005
Abstract
High resolution synchrotron X-ray powder diffraction (SXRPD) was used to study the temperature dependence of the oxygen deficient NdFeAsO superconducting compound. By employing a dense temperature sampling we have managed to reveal unnoticed structural modifications that start around 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 tetrahedron shows gradual modifications below 180K, which suddenly disappear at T strongly indicating a connection with superconductivity.
4 pages, 1 table, 5 figures
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