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Fe-57-Mossbauer studies of superconducting Rb0.8Fe1.6Se2.0 with T-C = 32.4 K were performed on single-crystalline and polycrystalline samples in the temperature range 4.2-295 K. They reveal the presence of 88% magnetic and 12% nonmagnetic Fe2+ species with the same polarization dependence of their hyperfine spectra. The magnetic species are attributed to the 16i sites of the root 5 x root 5 x 1 superstructure and the nonmagnetic Fe species to a nanosized phase observed in recent structural studies of superconducting KxFe2-ySe2 systems rather than to the vacant 4d sites in the root 5 x root 5 x 1 superstructure. The Fe-57 spectrum of a single-crystalline sample in an external field of 50 kOe applied parallel to the crystallographic c axis confirms the antiferromagnetic order between the fourfold ferromagnetic Fe(16i) supermoments and the absence of a magnetic moment at the Fe sites in the minority phase. A discussion of all spectral information and comparison with superconducting FeSe provides convincing evidence that the nanoscale phase separation is monitored by Mossbauer spectroscopy in Rb0.8Fe1.6Se2.0

physical review. b, condensed matter and materials physics

Phase separation in superconducting and antiferromagnetic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>Rb</mml:mi><mml:mrow><mml:mn>0.8</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mrow><mml:mn>1.6</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>probed by Mössbauer spectroscopy

Phase separation in superconducting and antiferromagneticRb0.8Fe1.6Se2probed by Mössbauer spectroscopy