Abstract
We have carried out 87Rb NMR measurements on single crystals with and without the superconducting (SC) transition to clarify whether the SC and the antiferromagnetic (AFM) states are microscopically coexistent or just phase-separated in the Rb-intercalated iron-selenide Rb x Fe2−y Se2. The 87Rb NMR spectra observed at temperature below 300 K for these crystals are clearly separable into two parts with different structures and widths. The broader spectrum can be explained by the presence of a region with an AFM spin structure proposed by neutron scattering studies. The narrower spectrum in the crystal with the SC transition can be understood from the temperature dependences of the spectral frequency-position and shape to stem from the SC region with T c = 30.8 K. Thus, we can clearly conclude that the superconductivity and the antiferromagnetism in the present system are phase-separated. Also, the crystal without the SC transition has two phase-separated regions with respective magnetic transitions at ∼500 and ∼50 K.
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