Single crystal growth and structural characterization of IRON TELLURIDE (cas 12023-03-9) doped with chromium and zinc

Add time:08/02/2019    Source:sciencedirect.com

An attempt to grow single crystals of Fe1.1−xMxTe (M=Cr, Zn) by crystallization from melt was undertaken. 4 trial growths for each element were performed with nominal compositions x=0.01, 0.025, 0.05 and 0.1. The characterization of obtained crystals was done using scanning electron microscope (SEM) revealed minimal (<1%) concentrations of the dopant, indicating very low solubility limit. Despite minimal concentrations of dopant, a notable change in the quality of the cleavage surfaces was observed, which were much better in the case of zinc doped samples. The structural details of crystals were obtained using single crystal diffraction and revealed that the prominent difference between the samples was caused by the content of the excess iron. The remaining parts of the samples were used for a neutron powder diffraction study, which demonstrated that the dopant influences structural and magnetic properties of the matrix albeit only in the polycrystalline form. Powdered samples with chromium revealed gradual decrease of the ordered magnetic moment and for the highest nominal Cr content only the orthorhombic part of the structural distortion remained at 5 K. On the other hand, sample synthesized with the highest zinc content showed almost no difference from the pure commensurate FeTe.

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