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Mössbauer studies of powdered single crystals of FeTe0.5Se0.5

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Mössbauer measurements performed on powdered single crystals of FeTe0.5Se0.5 (T c ~ 14.7 K) reveal minor content of two impurity phases, identified as Fe3O4 and Fe7Se8, among the major tetragonal phase. From the shape of the impurity subspectra it follows that Fe7Se8 behaves in a superparamagnetic manner, most likely because of randomly distributed Fe vacancies in the lattice structure of Fe–Te–Se. The magnetite content in the powdered absorber exposed to ambient air conditions remains unchanged during a period of 16 months. Ageing effects are observed for the samples stored under argon atmosphere and a small increase of the isomer shift of the doublet is detected. The presented temperature dependence of the hyperfine parameters can be explained as due to possible orthorhombic distortion or to temperature behaviour of the impurity phases Fe3O4 and Fe7Se8. A strong tendency for the formation of crystalline texture of the powdered sample is observed.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0953-2048/24/10/105010

Publication date: October 1, 2011

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