A Neutron Diffraction Investigation of Fe3Se4.

Andresen, Arne F.; Vestersjø, Egil; Haaland, A.; Gronowitz, Salo; Christiansen, Harald; Rosén, Ulf

doi:10.3891/acta.chem.scand.22-0827

Cited by 34 publications

(43 citation statements)

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“…Although the analysis of the diffraction data may allow to assign a monoclinic structure of the inclusions, further analysis of our magnetization data are not entirely consistent since the monoclinic Fe 3 Se 4 is reported to be ferrimagnetic [40,44,45] with the magnetic transition temperature and hysteretic magnetization curve even above room temperature. Our magnetization measurements are hysteretic at low temperatures but do not indicate such a behavior for the SC sample at room temperature where only an S-shape is seen.…”

Section: 2791(17) Fe2mentioning

confidence: 65%

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Structural inhomogeneities in FeTe0.6Se0.4: Relation to superconductivity

Prokeš

Schulze

Hartwig

et al. 2015

Journal of Crystal Growth

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Chemical and structural phase compositions of two single-crystalline samples prepared with different cooling rates from stoichiometric FeTe 0.6 Se 0.4 melts were studied. Both types of samples were investigated in a very comprehensive way using magnetic and electrical transport measurements combined with X-ray, neutron and electron backscatter diffraction. We show that slowly cooled samples are homogeneous on a microscopic scale with only a small excess of iron. Those slowly cooled samples do not exhibit bulk superconductivity down to 1.8 K. In contrast, fast-cooled samples are superconducting below about 14 K but are composed of several chemical phases: They consist of a matrix preserving the crystal structure of slow-cooled samples, and of core-shell structured dendritic inclusions (about 20-30 vol.%). These have different crystal structure and chemical composition and order magnetically at temperatures far above the superconducting transition temperature of the inhomogeneous samples. These structural and chemical inhomogeneities seem to play a vital role in the superconducting properties of this and similar iron-based systems as they lead to internal stress and act in a similar way as the application of the external pressure that reportedly increase the superconducting transition temperature in many iron pnictides and chalcogenides. We argue that a phase pure, homogeneous and stress-free FeTe 0.6 Se 0.4 is non-superconducting.

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Section: 2791(17) Fe2mentioning

confidence: 65%

“…(i) Since the core of inclusions have a composition close to Fe 0.60 Te 0.54 Se 0.46 as indicated by the EDX data, we have started with structural parameters published for monoclinic Fe 3 Se 4 [40]. The agreement between the best fit assuming the presence of the tetragonal matrix and monoclinic inclusions and the data is rather good.…”

Section: 2791(17) Fe2mentioning

confidence: 92%

Structural inhomogeneities in FeTe0.6Se0.4: Relation to superconductivity

Prokeš

Schulze

Hartwig

et al. 2015

Journal of Crystal Growth

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“…30% of the predicted value. Andresen (17) has reported similarly low values of 1.08 and 0.71 for the ordered moments of cations in the fully occupied and ordered vacancy layers, respectively, in the isostructural selenide, Fe Se . Such behavior has also been observed in structurally related ordered defect binary chalcogenides (18,19), including the extreme case of a moment of 0.14 for the vacancy layer cation in Cr Te (20).…”

Section: Discussionmentioning

confidence: 94%

Magnetic Structure and Spin Reorientation in the Ternary Sulfides, NixCr3−xS4(x=14, 12, 34)

Powell

Colgan

Ritter³

1999

Journal of Solid State Chemistry

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“…Among various investigated materials, Fe/ZnSe and FeSe/ZnSe systems are attracting interests because they are not only with the ferromagnetic/ semiconductor structure, but also can be grown on GaAs substrate [9,10]. Characterizations of bulk crystals of FeSe have been reported with Fe 3 Se 4 and Fe 7 Se 8 structures [11,12]. Furthermore, FeSe is preferably replaced by selenization technique [8,13,14], the selenization was performed with supplying a Se beam to the Fe films on GaAs substrate.…”

Section: Introductionmentioning

confidence: 99%