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Intrinsic percolative superconductivity in K_xFe_2−ySe₂ single crystals

Author： Shen B. Zeng B. Chen G. F. He J. B. Wang D. M. Yang H. Wen H. H.

Publisher： Edp Sciences

E-ISSN： 1286-4854|96|3|37010-37010

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.96, Iss.3, 2011-10, pp. : 37010-37010

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

Magnetic field penetration and magnetization hysteresis loops (MHLs) have been measured in K_xFe_2−ySe₂ single crystals. The magnetic field penetration shows a two-step feature with a very small full-magnetic-penetration field (≈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 K_xFe_2−ySe₂ at the same temperature is in general much smaller than that measured in Ba_0.6K_0.4Fe₂As₂ and Ba(Fe_0.92Co_0.08)₂As₂, and the MHLs in the latter two samples show a normal central peak near zero field. All these anomalies found in K_xFe_2−ySe₂ can be understood in the sense that the sample is percolative with weakly coupled superconducting islands.

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