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Electron-doped Sr(Co{1-x}Ni{x})2As2 single crystals with compositions x = 0to 0.9 were grown out of self-flux and SrNi2As2 single crystals out of Bi flux.The crystals were characterized using single-crystal x-ray diffraction (XRD),magnetic susceptibility chi(H,T), isothermal magnetization M(H,T), heatcapacity Cp(H,T), and electrical resistivity ho(H,T) measurements versusapplied magnetic field H and temperature T. The chi(T) data show that thecrystals exhibit an antiferromagnetic (AFM) ground state almost immediatelyupon Ni doping on the Co site. Ab-initio electronic-structure calculations forx = 0 and x = 0.15 indicate that a flat band with a peak in the density ofstates just above the Fermi energy is responsible for this initialmagnetic-ordering behavior on Ni doping. The Curie-Weiss-like T dependence of\chi in the paramagnetic (PM) state indicates dominant ferromagnetic (FM)interactions. The small ordered moments ~0.1 muB per transition metal atom andthe values of the Rhodes-Wohlfarth ratio indicate that the magnetism isitinerant. The Cp(T) at low T exhibits Fermi-liquid behavior for 0 < x < 0.15whereas an evolution to a logarithmic non-Fermi-liquid (NFL) behavior is foundfor x = 0.2 to 0.3. The logarithmic dependence is suppressed in an appliedmagnetic field. The low- T rho(H = 0,T) data show a T^2 dependence for 0 < x <0.20 and a power-law dependence with n < 2 for x = 0.20 and 0.30. These low-TNFL behaviors observed in the Cp and rho measurements are most evident near thequantum-critical concentration x ~ 0.3 at which a T = 0 composition-inducedtransition from the AFM phase to the PM phase occurs.

Non-Fermi-liquid behaviors associated with a magnetic quantum-critical point in Sr(Co{1-x}Ni{x})2As2 single crystals