Growth of (NaxKy)FezSe2 crystals by chlorides flux at low temperatures
Gang Wang, Tianping Ying, Yaobo Huang, Shifeng Jin, Lei Yan, Hong, Ding, Xiaolong Chen
TL;DR
This paper reports a low-temperature synthesis method for (NaxKy)FezSe2 crystals using chloride flux, resulting in enhanced superconducting properties and a new route for high-quality iron selenide superconductor production.
Contribution
It introduces a novel low-temperature chloride flux method for synthesizing (NaxKy)FezSe2 crystals with improved superconducting phase content.
Findings
K prefers to intercalate more than Na in the FeSe layers
Crystals show increased superconducting volume fraction
Transport properties exhibit new features
Abstract
(NaxKy)FezSe2 crystals are prepared by Na, Fe, and Se as starting materials in NaCl/KCl flux at low temperatures~720 {\deg}C. It is found that K is more preferred than Na to enter in between FeSe layers and forms the phase. Thus-obtained crystals contain more superconducting phase in volume fraction and exhibit new features in transport property. Our results provide a promising new synthetic route for preparing quality crystals of iron selenide superconductors.
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