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NMR Study in the Iron-Selenide<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Rb</mml:mi><mml:mn>0.74</mml:mn></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>1.6</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>: Determination of the Superconducting Phase as Iron Vacancy-Free<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Rb</mml:mi><mml:mn>0.3</mml:mn></mml:msub><mml:…
77Se and 87Rb nuclear magnetic resonance (NMR) experiments on Rb0.74Fe1.6Se2 reveal clearly distinct spectra originating from a majority antiferromagnetic (AF) and a minority metallic-superconducting (SC) phase. The very narrow NMR line of the SC phase evidences the absence of Fe vacancies and any trace of AF order. The Rb content …