Magnetic (CoFe2O4)0.1(CeO2)0.9nanocomposite as effective pinning centers in FeSe0.1Te0.9thin films
- 11 December 2015
- journal article
- research article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 28 (2), 025702
- https://doi.org/10.1088/0953-8984/28/2/025702
Abstract
Magnetic epitaxial (CoFe2O4)0.1(CeO2)0.9 nanocomposite layers were incorporated into superconducting FeSe0.1Te0.9 thin films as either a cap layer or a buffer layer. Both capped and buffered samples show an enhancement of the superconducting property compared to the reference sample without the incorporated layer, while the capped one shows the best pinning properties of all the samples. Specifically for the capped sample, the critical temperature Tc is ~12.5 K, while the self-field critical current density J(c)(sf )increases to as high as 1.20 MA cm(-2) at 4 K. Its J(c)(in-field) value shows a slower decrease with increasing applied magnetic field, with the lowest power-law exponent α values (derived following Jc[formula: see text](μ0H)(-α) by the log(Jc) − log(μ0H) plot) of 0.20, 0.23 and 0.33 at 2 K, 4 K and 8 K, respectively. This nanocomposite capped sample also exhibits a high upper critical field Hc2(0) of 166 T, which indicates its potential in high field applications. This pinning method provides an effective way of enhancing the superconducting property of iron chalcogenide thin film.Keywords
Funding Information
- Air Force Office of Scientific Research (FA9550-09-1-0114)
- Division of Materials Research (DMR-0846504)
This publication has 27 references indexed in Scilit:
- A simplified superconducting coated conductor design with Fe-based superconductors on glass and flexible metallic substratesJournal of Alloys and Compounds, 2015
- Nanostructured pinning centers in FeSe0.1Te0.9thin films for enhanced superconducting propertiesSuperconductor Science and Technology, 2014
- Enhancement of the superconducting transition temperature in FeSe epitaxial thin films by anisotropic compressionApplied Physics Letters, 2013
- High current superconductivity in FeSe0.5Te0.5-coated conductors at 30 teslaNature Communications, 2013
- Fe–Te–Se epitaxial thin films with enhanced superconducting propertiesSuperconductor Science and Technology, 2012
- Epitaxial Growth of FeSe0.5Te0.5Thin Films on CaF2Substrates with High Critical Current DensityApplied Physics Express, 2011
- To use or not to use cool superconductors?Nature Materials, 2011
- Superconductivity in epitaxial thin films ofPhysical Review B, 2010
- Superconductivity in Iron Telluride Thin Films under Tensile StressPhysical Review Letters, 2010
- Superconductivity in the PbO-type structure α-FeSeProceedings of the National Academy of Sciences of the United States of America, 2008