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We report $^{75}$As NMR measurements in CaFe$_2$As$_2$, made under appliedpressures up to 0.83 GPa produced by a standard clamp pressure cell. Our datareveal phase segregation of paramagnetic (PM) and antiferromagnetic (AFM)phases over a range of pressures, with the AFM phase more than 90 % dominant atlow temperatures. In situ RF susceptibility measurements indicate the presenceof superconductivity. $^{75}$As spin-lattice relaxation experiments indicatethat the $^{75}$As nuclei sample the superconductivity while in themagnetically-ordered environment.

NMR investigation of superconductivity and antiferromagnetism in CaFe$_2$As$_2$ under pressure