Growth and characterization of A_{1-x}K_xFe_2As_2 (A = Ba, Sr) single crystals with x=0 - 0.4

Abstract

Single crystals of A${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ (A=Ba, Sr) with high quality have been grown successfully by FeAs self-flux method. The samples have sizes up to 4 mm with flat and shiny surfaces. The X-ray diffraction patterns suggest that they have high crystalline quality and c-axis orientation. The non-superconducting crystals show a spin-density-wave (SDW) instability at about 173 K and 135 K for Sr-based and Ba-based compound, respectively. After doping K as the hole dopant into the BaFe${}_2$As${}_2$ system, the SDW transition is smeared, and superconducting samples with the compound of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ (0 $<x⩽$ 0.4) are obtained. The superconductors characterized by AC susceptibility and resistivity measurements exhibit very sharp superconducting transition at about 36 K, 32 K, 27 K and 23 K for x= 0.40,0.28,0.25 and 0.23, respectively.

9 pages, 6 figures, 1 table. This paper together with new data are modified into a new paper

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