Control of the superconducting properties of Sr2-xCa xVO3FeAs through isovalent substitution

Corkett, A.J., Free, D.G., Cassidy, S.J., Ramos, Silvia, Clarke, S.J. (2014) Control of the superconducting properties of Sr2-xCa xVO3FeAs through isovalent substitution. Journal of Solid State Chemistry, 216 . pp. 91-98. ISSN 0022-4596. (doi:10.1016/j.jssc.2014.02.024) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1016/j.jssc.2014.02.024

Abstract

The effect of the isovalent substitution of Sr2+ by Ca 2+ on the structure and superconducting properties of Sr 2-xCaxVO3FeAs is described in the compositional range 0 â?¤ x â?¤ 0.5. SQUID magnetometry measurements reveal that after an initial increase in Tc, which is maximised at 29.5 K in Sr 1.95Ca0.05VO3FeAs, a rapid suppression of superconductivity is observed with increasing x. XANES spectra of Sr 2-xCaxVO3FeAs collected on the Fe and V absorption K-edges show that the position of both edges are invariant with composition within the experimental uncertainty. A combination of synchrotron X-ray powder diffraction and neutron powder diffraction techniques is used to rationalise the observed changes in Tc with x, in terms of changes to the structure of the FeAs layer upon partial Ca substitution. These findings demonstrate that superconductivity in the Fe-based superconductors is extremely sensitive to the crystal structure with Tc maximised in samples with regular FeAs4-tetrahedra.

Item Type: Article
DOI/Identification number: 10.1016/j.jssc.2014.02.024
Uncontrolled keywords: Crystal structure, Iron-based superconductor, XANES, Crystal structure, Diffraction, High temperature superconductors, Superconductivity, Uncertainty analysis, X ray powder diffraction, Compositional range, Experimental uncertainty, Fe-based superconductors, Iron-based superconductors, Isovalent substitution, Superconducting properties, Synchrotron X ray powder diffraction, XANES, Calcium
Subjects: Q Science > QC Physics > QC176 Solid state physics
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Silvia Ramos
Date Deposited: 28 Apr 2015 10:18 UTC
Last Modified: 29 May 2019 14:09 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46980 (The current URI for this page, for reference purposes)
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