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Anomalous behavior in the atomic structure of Nb3Sn under high pressure
Authors:
Irene
Schiesaro
(Università Roma Tre)
,
Simone
Anzellini
(Diamond Light Source)
,
Rita
Loria
(Università Roma Tre)
,
Raffaella
Torchio
(ESRF—European Synchrotron Radiation Facility)
,
Tiziana
Spina
(Fermilab)
,
René
Flükiger
(University of Geneva)
,
Tetsuo
Irifune
(Ehime University)
,
Enrico
Silva
(Università Roma Tre)
,
Carlo
Meneghini
(Università Roma Tre)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Crystals
, VOL 11
State:
Published (Approved)
Published:
March 2021

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.
Journal Keywords: Nb3Sn; local atomic structure; high pressure; XAFS
Subject Areas:
Materials,
Physics
Facility: BM23 at ESRF
Added On:
30/03/2021 09:30
Documents:
crystals-11-00331-v2.pdf
Discipline Tags:
Superconductors
Quantum Materials
Materials Science
Technical Tags: