Upper fields and critical current density of K0.58Fe1.56Se2 single crystals grown by one step technique

Details Upper fields and critical current density of K0.58Fe1.56Se2 single crystals grown by one step technique Upper fields and critical current density of K0.58Fe1.56Se2 single crystals grown by one step technique

2011-03-15

arxiv.org/abs/1103.2904v2

Physics

Condensed Matter

Superconductivity

14 pages, 6 figures. The damaged figures (fig.1 and fig.5) during the PDF file conversion were updated in the new version

Scientific paper

Single crystals of K0.58Fe1.56Se2 were successfully synthesized by a new single step process with the onset superconducting transition temperatures 31.9 K. The x-ray diffraction patterns suggest that they have high crystalline quality and c-axis orientation. A possible modulation structure of Fe-vacancy along c axis was observed. The upper critical field has been determined with the magnetic field along ab-plane and c-axis, yielding an anisotropy of about 3.3. It has also been shown that the critical current density of the K0.58Fe1.56Se2 is about 1.7x10^4 A/cm^2 at 5 K.

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