Volume 91, Number 5, September 2010
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||21 September 2010|
Lattice anomalies in the FeAs4 tetrahedra of the NdFeAsO0.85 superconductor that disappear at Tc
Solid State Physics Department, School of Physics, University of Athens - GR-15784 Athens, Greece, EU
2 ESRF - BP 220, Grenoble, Cedex 9, F-38043 France, EU
3 Department of Physics, National Technical University of Athens - 157 80 Athens, Greece, EU
4 National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences - P.O. Box 603, Beijing, China
Accepted: 24 August 2010
High-resolution synchrotron X-ray powder diffraction (SXRPD) was used to study the temperature dependence of the oxygen-deficient NdFeAsO0.85 superconducting compound. By employing a dense temperature sampling we have managed to reveal unnoticed structural modifications that start around ∼180 K, 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 FeAs4 tetrahedron shows gradual modifications below ∼180 K, which suddenly disappear at Tc strongly indicating a connection with superconductivity.
PACS: 74.70.-b – Superconducting materials other than cuprates / 74.70.Xa – Pnictides and chalcogenides / 61.05.cp – X-ray diffraction
© EPLA, 2010
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