Intrinsic Percolative Superconductivity in KxFe2-ySe2 Single Crystals

Details Intrinsic Percolative Superconductivity in KxFe2-ySe2 Single Crystals Intrinsic Percolative Superconductivity in KxFe2-ySe2 Single Crystals

2011-04-11

arxiv.org/abs/1104.2008v2

EPL 96(3), (2011) 37010

Physics

Condensed Matter

Superconductivity

5 page, 4 figures

Scientific paper

10.1209/0295-5075/96/37010

Magnetic field penetration and magnetization hysteresis loops (MHLs) have been measured in KxFe2-ySe2 single crystals. The magnetic field penetration shows a two-step feature with a very small full-magnetic-penetration field (Hp1= 300 Oe at 2 K), and accordingly the MHL exhibits an abnormal vanishing of the central peak near zero field below 13 K. The width of the MHL in KxFe2-ySe2 at the same temperature is in general much smaller than that measured in the relatives Ba0.6K0.4Fe2As2 and Ba(Fe0.92Co0.08)2As2, and the MHLs in the latter two samples show the normal central peak near zero field. All these anomalies found in KxFe2-ySe2 can be understood in the picture that the sample is percolative with weakly coupled superconducting islands.

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