Annealing Effect on Microstructure and Superconductivity of KxFeySe2 Synthesized by an Easy One-step Method

High-quality superconducting K x Fe y Se 2 single crystals were synthesized using an easy one-step method. Detailed annealing studies were performed to make clear the phase formation process in K x Fe y Se 2 . Compatible observations were found in temperature-dependent X-ray diffraction patterns, ba...

Full description

Saved in:
Bibliographic Details
Published in:Journal of low temperature physics 2014, Vol.175 (3-4), p.543-553
Main Authors: Zhou, W., Li, X., Zhou, X., Yuan, F. F., Ding, Y., Zhuang, J. C., Sun, Y., Zhou, H. L., Shi, Z. X.
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Condensed Matter Physics
Magnetic Materials
Magnetism
Physics
Physics and Astronomy
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:High-quality superconducting K x Fe y Se 2 single crystals were synthesized using an easy one-step method. Detailed annealing studies were performed to make clear the phase formation process in K x Fe y Se 2 . Compatible observations were found in temperature-dependent X-ray diffraction patterns, back-scattered electron images and corresponding electromagnetic properties, which proved that good superconductivity performance was closely related to the microstructure of superconducting component. Analysis based on the scaling behavior of flux pinning force indicated that the dominant pinning mechanism was Δ T c pinning and independent of connectivity. The annealing dynamics studies were also performed, which manifested that the humps in temperature-dependent resistance curves were induced by competition between the metallic/superconducting and the semiconducting/insulating phases.
ISSN:0022-2291
1573-7357
DOI:10.1007/s10909-014-1097-5