Origin of the Higher-Tc Phase in the KxFe2−ySe2 System
Superconductivity (cond-mat.supr-con)
13. Climate action
Condensed Matter - Superconductivity
0103 physical sciences
FOS: Physical sciences
10. No inequality
01 natural sciences
DOI:
10.7566/jpsj.85.044710
Publication Date:
2016-03-31T01:26:21Z
AUTHORS (10)
ABSTRACT
14 pages, 6 figures<br/>Single crystals of K$_x$Fe$_{2-y}$Se$_2$ are prepared by quenching at various temperatures. The crystals obtained at higher quenching temperatures have a surface morphology with mesh-like texture. They show a sharp superconducting transition at $T_\rm{c}$ ~32 K with a large shielding volume fraction. On the other hand, the crystals prepared without quenching show an onset superconducting transition at ~44 K and a zero resistivity around ~33 K, and they possess island-like regions on the surface with a larger amount of Fe incorporation. In-situ high-temperature single crystal X-ray diffraction measurements tell us the Fe-vacancy ordered phase is generated at a temperature region around 270 ��C via iron diffusion. The creation of this Fe-vacancy ordered phase may become a driving force of the growth of the higher $T_\rm{c}$ phase. The superconductivity at ~44 K is attributed to a metallic phase with no Fe-vacancy.<br/>
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