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Fe–As Bond-Dynamics Revealed from the Arsenic K-Edge EXAFS Studies of NdFeAsO1−x F x Iron-Pnictide Superconductors

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Abstract

Arsenic K-edge extended x-ray absorption fine structure (EXAFS) spectroscopy results of the NdFeAsO1−x F x (x=0 and 0.12) system at room temperature and 12 K are presented. The Fe–As bond seems to be hardly affected by doping and temperature. However, a careful analysis of the temperature dependence of the Fe–As bond mean-square relative displacements reveals a hardening of the Fe–As bond force constant in the superconductor compared to the NdFeAsO, revealing the distinct local lattice dynamics in the active iron-arsenic layer in governing the superconducting properties.

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Acknowledgements

The author thanks all the collaborators, who have contributed to this study, in particular, Naurang Lal Saini, Antonella Iadecola, Lorenzo Malavasi, and Gianluca Artioli. He acknowledges Antonio Bianconi for stimulating discussions and encouragement.

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  1. Rome International Center of Materials Science, Superstripes (RICMaSS), via dei Sabelli 119A, 00185, Rome, Italy

    Boby Joseph

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  1. Boby Joseph
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Correspondence to Boby Joseph.

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This paper is dedicated to the fond memory of the late Professor Joseph Ashkenazi.

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Joseph, B. Fe–As Bond-Dynamics Revealed from the Arsenic K-Edge EXAFS Studies of NdFeAsO1−x F x Iron-Pnictide Superconductors. J Supercond Nov Magn 27, 977–979 (2014). https://doi.org/10.1007/s10948-013-2421-z

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