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	Anomalous behavior in the atomic structure of Nb3Sn under high pressure Irene Schiesaro , Simone Anzellini , Rita Loria , Raffaella Torchio , Tiziana Spina , René Flükiger , Tetsuo Irifune , Enrico Silva , Carlo Meneghini Crystals 11 DOI: 10.3390/cryst11040331 Open Access Show Abstract ▼ Abstract: In the present study, the local atomic structure of a Nb3Sn superconductor sample has been probed by X-ray absorption fine structure (XAFS) as a function of hydrostatic pressure (from ambient up to 26 GPa) using a diamond anvil cell set-up. The analysis of the Nb-K edge extended X-ray absorption fine structure (EXAFS) data was carried out combining standard multi shell structural refinement and reverse Monte Carlo method to provide detailed in situ characterization of the pressure-induced evolution of the Nb local structure in Nb3Sn. The results highlight a complex evolution of Nb chains at the local atomic scale, with a peculiar correlated displacement of Nb–Nb and Nb–Nb–Nb configurations. Such a local effect appears related to anomalies evidenced by X-ray diffraction in other superconductors belonging to the same A15 crystallographic structure.	Mar 2021

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