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We systematically studied the transport properties of single crystals of$Eu_{1-x}Sr_xFe_{2-y}$Co$_{y}As_2$. Co doping can suppress the spin-densitywave (SDW) ordering and induces a superconducting transition, but a resistivityreentrance due to the antiferromagnetic ordering of $Eu^{2+}$ spins isobserved, indicating the competition between antiferromagnetism (AFM) andsuperconductivity. It is striking that the resistivity reentrance can becompletely suppressed by external magnetic field (H) because a metamagnetictransition from antiferromagnetism to ferromagnetism for $Eu^{2+}$ spins isinduced by magnetic field. Superconductivity without resistivity reentranceshows up by partial substitution of Eu$^{2+}$ with non-magnetic Sr$^{2+}$ tocompletely destroy the AFM ordering of $Eu^{2+}$ spins. These results suggestthat the antiferromagnetism destroys the superconductivity, while theferromagnetism can coexist with the superconductivity in the iron-basedhigh-$T_c$ superconductors.

Magnetism and superconductivity in single crystals $Eu_{1-x}Sr_xFe_{2-y}Co_{y}As_2$