Spin Susceptibility, Phase Diagram, and Quantum Criticality in the Eelctron-Doped High T_{\scale70%\text{c}} Superconductor Ba(Fe_{1-x}Co_{x})_{2}As_{2}
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چکیده
We report a systematic investigation of Ba(Fe1 xCox)2As2 based on transport and As 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 when the tendency toward spin ordering completely diminishes. Our findings point toward the presence of a quantum critical point near xc between the SDW (spin density wave) and superconducting phases.
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تاریخ انتشار 2009