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High resolution synchrotron X-ray powder diffraction (SXRPD) was used tostudy the temperature dependence of the oxygen deficient NdFeAsO$_{0.85}$superconducting compound. By employing a dense temperature sampling we havemanaged to reveal unnoticed structural modifications that start around$\sim$180K, and disappear at the transition temperature. The data show minorchanges of the structural characteristics in the Nd-O charge reservoir layerwhile in the superconducting Fe-As layer the FeAs$_{4}$ tetrahedron showsgradual modifications below $\sim$180K, which suddenly disappear at T$_{\rm c}$strongly indicating a connection with superconductivity.

Lattice anomalies in the FeAs$_{\rm 4}$ tetrahedra of the NdFeAsO$_{\rm 0.85}$ superconductor that disappear at T$_{\rm c}$