Abstract
We present results of ac-magnetic susceptibility, dc-magnetization, and magnetotransport measurements on a single crystal of a magnetic Eu(Fe${}_{0.81}$Co${}_{0.19}$)${}_{2}$As${}_{2}$ superconductor. The compound undergoes two phase transitions: into a canted antiferromagnetic state at ${T}_{N}=16.5$ K and a superconducting state at ${T}_{c}\ensuremath{\sim}5.15$ K in a zero field. Based on our experimental results, we conclude that ${T}_{c}$ can further be increased up to 6.5 K with magnetic fields applied parallel to the $ab$ plane of crystals. We argue that the tuning superconductivity may be actuated by suppressing the ferromagnetic component along the c axis of the Eu${}^{2+}$ moments, diminishing the orbital pair-breaking effect.
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