NMR Study in the Iron-Selenide Rb0.74Fe1.6Se2: Determination of the 
Superconducting Phase as Iron Vacancy-Free Rb0.3Fe2Se2

Texier, Y.; Deisenhofer, J.; Tsurkan, V.; Loidl, A.; Inosov, D. S.; Friemel, G.; Bobroff, J.

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NMR Study in the Iron-Selenide Rb_0.74Fe_1.6Se₂: Determination of the Superconducting Phase as Iron Vacancy-Free Rb_0.3Fe₂Se₂

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Inosov, D. S.
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Texier, Y., Deisenhofer, J., Tsurkan, V., Loidl, A., Inosov, D. S., Friemel, G., et al. (2012). NMR Study in the Iron-Selenide Rb_0.74Fe_1.6Se₂: Determination of the Superconducting Phase as Iron Vacancy-Free Rb_0.3Fe₂Se₂. Physical Review Letters, 108(23): 237002.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C315-E

Abstract

Se-77 and Rb-87 nuclear magnetic resonance (NMR) experiments on Rb-0.Fe-74(1). Se-6(2) 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 of the SC phase is deduced from intensity measurements identifying Rb0.3(1)Fe2Se2 as the actual composition of the SC fraction. The resulting estimate of 0.15 electrons/Fe brings this class of superconductors 245 family closer to the other Fe-based superconductor families.