Control of the superconducting properties of Sr2-xCaxVO3 FeAs through isovalent substitution

被引：6

作者：

Corkett, Alex J. ^{[1
]}

Free, David G. ^{[1
]}

Cassidy, Simon J. ^{[1
,2
]}

Ramos, Silvia ^{[2
]}

Clarke, Simon J. ^{[1
]}

机构：

[1] Univ Oxford, Dept Chem, Inorgan Chem Lab, Oxford OX1 3QR, England

[2] Diamond Light Source Ltd, Didcot OX11 0DE, Oxon, England

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2014年 / 216卷

基金：

英国工程与自然科学研究理事会;

关键词：

Iron-based superconductor; Crystal structure; XANES;

D O I：

10.1016/j.jssc.2014.02.024

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The effect of the isovalent substitution of Sr2+ by Ca2+ on the structure and superconducting properties of Sr2-xCaxVO3FeAs is described in the compositional range 0 <= x <= 0.5. SQUID magnetometry measurements reveal that after an initial increase in T-c, which is maximised at 29.5 K in Sr1.95Ca0.05VO3FeAs. a rapid suppression of superconductivity is observed with increasing x. XANES spectra of Sr2-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 T-c 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-c maximised in samples with regular FeAs4-tetrahedra. (C) 2014 Elsevier Inc. All rights reserved.

引用

页码：91 / 98

页数：8

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