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• W2963091570 abstract "${}^{57}$Fe-Mossbauer studies of superconducting Rb${}_{0.8}$Fe${}_{1.6}$Se${}_{2.0}$ 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 Fe${}^{2+}$ species with the same polarization dependence of their hyperfine spectra. The magnetic species are attributed to the 16$i$ sites of the $sqrt{5}ifmmodetimeselsetexttimesfi{}sqrt{5}ifmmodetimeselsetexttimesfi{}1$ superstructure and the nonmagnetic Fe species to a nanosized phase observed in recent structural studies of superconducting K${}_{x}$Fe${}_{2ensuremath{-}}$${}_{y}$Se${}_{2}$ systems rather than to the vacant 4$d$ sites in the $sqrt{5}ifmmodetimeselsetexttimesfi{}sqrt{5}ifmmodetimeselsetexttimesfi{}1$ superstructure. The ${}^{57}$Fe 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(16$i$) 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 Rb${}_{0.8}$Fe${}_{1.6}$Se${}_{2.0}$." @default.
• W2963091570 created "2019-07-30" @default.
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• W2963091570 date "2011-11-15" @default.
• W2963091570 modified "2023-10-03" @default.
• W2963091570 title "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" @default.
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• W2963091570 doi "https://doi.org/10.1103/physrevb.84.180508" @default.
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