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We performed nuclear magnetic resonance (NMR) measurements to investigate theevolution of spin-density-wave (SDW) and superconducting (SC) states uponelectron doping in CaFe_{1-x}Co_{x}AsF, which exhibits an intermediate phasediagram between those of LaFeAsO_{1-x}F_x and Ba(Fe_{1-x}Co_x)_2As_2. We foundthat homogeneous coexistence of the incommensurate SDW and SC states occursonly in a narrow doping region around the crossover regime, which supportsS_{+-}-wave symmetry. However, only the structural phase transition survivesupon further doping, which agrees with predictions from orbital fluctuationtheory. The transitional features upon electron doping imply that both spin andorbital fluctuations are involved in the superconducting mechanism.

Spin density wave and superconductivity in CaFe_{1-x}Co_{x}AsF studied by nuclear magnetic resonance