Publication Type
Journal
Journal Name
Journal of the Physical Society of Japan
Publication Date
Volume
78
Issue
1
Abstract
We report a systematic investigation of Ba(Fe1��xCox)2As2 based on transport and 75As NMR measurements, and establish the electronic phase diagram. We demonstrate that doping progressively suppresses the uniform spin susceptibility and low frequency spin fluctuations.
The optimum superconducting phase emerges at xc ~ 0.08 from a non-Fermi-liquid which exhibits T-linear resistivity. Our findings point toward the presence of a quantum critical point near xc between the SDW (spin density wave) and superconducting phases.
