Abstract
Mössbauer spectra of single crystals of sulfur-doped iron selenide FeSe0.91S0.09 are studied in a wide temperature range, including the vicinity of structural and superconducting transitions. It is found that iron atoms exhibit a nonmagnetic state even in the range of helium temperatures, which can be attributed to the low-spin state of Fe2+ (3d6, S = 0) ions. It is shown that this state remains nearly unchanged at temperatures close to the superconducting transition temperature. This means that the low-spin state of iron ions most probably results from some structural features and is not directly related to superconductivity. The temperature dependence of the parameters characterizing the hyperfine interaction exhibits several anomalies in the ranges of structural and electronic transitions. The Debye temperature ΘM = 478 K determined for the iron sublattice turns out to be much higher than the value ΘM = 285 K for the undoped FeSe1 - δ compound.
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Funding
The Mössbauer studies were supported by the Ministry of Science and Higher Education of the Russian Federation (state assignment to the Federal Research Center Crystallography and Photonics, Russian Academy of Sciences). The transport measurements were supported by the Russian Science Foundation (project no. 19-12-00414). The crystal growth tasks were supported by the Government of the Russian Federation (state contract no. 02.A03.21.0006, resolution no. 211). The work in the field of synthesis and characterization of the crystals at the Kazan Federal University was supported by the Ministry of Science and Higher Education of the Russian Federation (competitive growth program for the Kazan Federal University).
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Russian Text © The Author(s), 2019, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2019, Vol. 110, No. 8, pp. 557–562.
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Frolov, K.V., Lyubutin, I.S., Chareev, D.A. et al. Mössbauer Spectroscopy Study of FeSe0.91S0.09 Superconductor Single Crystals. Jetp Lett. 110, 562–567 (2019). https://doi.org/10.1134/S0021364019200049
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DOI: https://doi.org/10.1134/S0021364019200049