Structural and Superconducting Properties of K$_{0.8}$Fe$_{1.6+x}$Se$_{2 }$ single crystals

ORAL

Abstract

We report structural and superconducting properties of K0.8Fe1.6+xSe2 single crystals. Superconducting properties were studied by using transport, specific heat and magnetization measurements, and compared with that of FeSe$_{1-x}$Te$_{x}$. We found the $c$-axis resistive transition and specific heat behavior are distinctively different in these two classes of materials. Structural properties were studied via transmission electron microscopy and energy-dispersive X-ray spectroscopy. We found large scale structural and chemical disorder in the K0.8Fe1.6+xSe2 samples. The relationship between structural and superconducting properties in K0.8Fe1.6+xSe2 will be discussed.

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Authors

  • Su Jung Han

    Brookhaven National Lab, Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA

  • Genda Gu

    Brookhaven National Laboratory, Brookhaven National Lab, CMP\&MS, Brookhaven National Laboratory, CMP\&MS Department, Brookhaven National Laboratory, Brookhaven National Laboratory, Upton, NY, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA

  • Qiang Li

    Condensed Matter Physics \& Materials Science Department, Brookhaven National Laboratory, Upton, New York, 11973, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973-5000, USA