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Homogeneity Range of Ternary 11-Type Chalcogenides Fe1+y Te1-xSex

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Koz,  C.
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Rößler,  Sahana
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Wirth,  Steffen
Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126841

Schwarz,  Ulrich
Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Koz, C., Rößler, S., Wirth, S., & Schwarz, U. (2017). Homogeneity Range of Ternary 11-Type Chalcogenides Fe1+y Te1-xSex. Journal of Superconductivity and Novel Magnetism, 30(7), 2001-2006. doi:10.1007/s10948-016-3632-x.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-AC88-C
Abstract
The 11-type Fe-chalcogenides belong to the family of Fe-based superconductors. In these compounds, the interstitial Fe is known to strongly influence the magnetic and superconducting properties. Here, we present the chemical homogeneity range of ternary compounds Fe1 + y Te1-x Se (x) based on powder x-ray diffraction, energy dispersive x-ray analysis, and magnetization measurements. Our investigations show that the maximum amount of excess Fe in homogeneous Fe1 + y Te1-x Se (x) decreases with increase in Se substitution for Te. Using our synthesis procedure, single-phase Fe1 + y Te1-x Se (x) , with 0.5 ae<currency> x < 1 could not be formed for any amount of excess Fe. Further, the superconducting volume fraction in the material is found to be strongly suppressed by excess Fe.