Abstract
It is known that, during the synthesis of superconducting EuRbFe4As4 single crystals, inclusions of its parent phase EuFe2As2 are encountered. The kinetics of the formation of the orthorhombic phase in EuRbFe4As4 crystals containing a large fraction of the EuFe2As2 phase is studied using polarization optical microscopy. It is shown that the orthorhombic phase grows into the tetragonal one in the form of stripes that form macrodomains with one of the possible crystallographic orientations. Then these domains are abruptly penetrated by parallel stripes of the orthorhombic phase having the second orientation, as a result of which a twin system of orthorhombic domains is formed. The process is accompanied by the appearance of macrostresses: stretching and compression waves with a characteristic period of 100–300 μm along and across the twin system, which lead to spatial modulation of the magnetic permeability. It is found that even weak magnetic fields (up to 100 Oe) significantly affect the spatial distribution of the twin structure producing an effect similar to external stresses.
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The work was carried out at the Osipyan Institute of Solid State Physics, Russian Academy of Sciences, within the framework of a State Assignment. The authors express their gratitude to O.A. Tikhomirov for discussion of the research results.
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Uspenskaya, L.S., Sidelnikov, M.S., Pervakov, K.S. et al. Visualization of Structural Domains in a Single Crystal of Iron Pnictide EuFe2As2. J. Surf. Investig. 18, 47–52 (2024). https://doi.org/10.1134/S1027451024010191
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DOI: https://doi.org/10.1134/S1027451024010191