Crystal structure of two Fe1+y(Te1-xSex) x=0.4 single crystals as a function of a heat treatment
In the proposed experiment we suggest to study two Fe1+y(Te1-xSex) x=0.4 single crystals that differ in the sample preparation. Although having the same overall composition, one sample is homogeneous, the other consisting from two phases (this sample appears to be superconducting). In the latter case have inclusions the same orientation with respect to the matrix enabling thus the crystal structure determination of both the matrix and the secondary phase. We suggest the room-temperature and a heat-treatment (up to 800 K) study of the inhomogeneous sample along with the room temperature study of the homogeneous sample. We anticipate that at elevated temperatures the inhomogeneous sample becomes homogeneous again and both systems will have the same crystal structure. The study should be able to resolve controversal claims in the literature concerning the pahse purity and question which phase hosts the superconductivity.
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PROKES Karel; HARTWIG Steffen; LANDSGESELL Sven; OULADDIAF Bachir; QURESHI Navid and WURMEHL Sabine. (2014). Crystal structure of two Fe1+y(Te1-xSex) x=0.4 single crystals as a function of a heat treatment. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-15-606
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