Control of the superconducting properties of Sr2-xCaxVO3 FeAs through isovalent substitution
The effect of the isovalent substitution of Sr by Ca on the structure and superconducting properties of Sr Ca VOFeAs is described in the compositional range 0≤x≤0.5. SQUID magnetometry measurements reveal that after an initial increase in T, which is maximised at 29.5 K in SrCaVOFeAs, a rapid suppre...
| Main Authors: | , , , , |
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| Format: | Journal article |
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2014
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| _version_ | 1797062831897575424 |
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| author | Corkett, A Free, D Cassidy, S Ramos, S Clarke, S |
| author_facet | Corkett, A Free, D Cassidy, S Ramos, S Clarke, S |
| author_sort | Corkett, A |
| collection | OXFORD |
| description | The effect of the isovalent substitution of Sr by Ca on the structure and superconducting properties of Sr Ca VOFeAs is described in the compositional range 0≤x≤0.5. SQUID magnetometry measurements reveal that after an initial increase in T, which is maximised at 29.5 K in SrCaVOFeAs, a rapid suppression of superconductivity is observed with increasing x. XANES spectra of Sr Ca VOFeAs 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 T 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 T maximised in samples with regular FeAs-tetrahedra. © 2014 Elsevier Inc. All rights reserved. |
| first_indexed | 2024-03-06T20:51:13Z |
| format | Journal article |
| id | oxford-uuid:37a4de99-e27a-4999-837d-22d2a14a253d |
| institution | University of Oxford |
| last_indexed | 2024-03-06T20:51:13Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | oxford-uuid:37a4de99-e27a-4999-837d-22d2a14a253d2022-03-26T13:45:14ZControl of the superconducting properties of Sr2-xCaxVO3 FeAs through isovalent substitutionJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:37a4de99-e27a-4999-837d-22d2a14a253dSymplectic Elements at Oxford2014Corkett, AFree, DCassidy, SRamos, SClarke, SThe effect of the isovalent substitution of Sr by Ca on the structure and superconducting properties of Sr Ca VOFeAs is described in the compositional range 0≤x≤0.5. SQUID magnetometry measurements reveal that after an initial increase in T, which is maximised at 29.5 K in SrCaVOFeAs, a rapid suppression of superconductivity is observed with increasing x. XANES spectra of Sr Ca VOFeAs 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 T 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 T maximised in samples with regular FeAs-tetrahedra. © 2014 Elsevier Inc. All rights reserved. |
| spellingShingle | Corkett, A Free, D Cassidy, S Ramos, S Clarke, S Control of the superconducting properties of Sr2-xCaxVO3 FeAs through isovalent substitution |
| title | Control of the superconducting properties of Sr2-xCaxVO3 FeAs through isovalent substitution |
| title_full | Control of the superconducting properties of Sr2-xCaxVO3 FeAs through isovalent substitution |
| title_fullStr | Control of the superconducting properties of Sr2-xCaxVO3 FeAs through isovalent substitution |
| title_full_unstemmed | Control of the superconducting properties of Sr2-xCaxVO3 FeAs through isovalent substitution |
| title_short | Control of the superconducting properties of Sr2-xCaxVO3 FeAs through isovalent substitution |
| title_sort | control of the superconducting properties of sr2 xcaxvo3 feas through isovalent substitution |
| work_keys_str_mv | AT corketta controlofthesuperconductingpropertiesofsr2xcaxvo3feasthroughisovalentsubstitution AT freed controlofthesuperconductingpropertiesofsr2xcaxvo3feasthroughisovalentsubstitution AT cassidys controlofthesuperconductingpropertiesofsr2xcaxvo3feasthroughisovalentsubstitution AT ramoss controlofthesuperconductingpropertiesofsr2xcaxvo3feasthroughisovalentsubstitution AT clarkes controlofthesuperconductingpropertiesofsr2xcaxvo3feasthroughisovalentsubstitution |