Visualization of structural domains in a single crystal of iron pnictide EuFe2As2

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Resumo

It is known that during the synthesis of superconducting EuRbFe4As4 single crystals, inclusions of its parent EuFe2As2 phase are encountered. The kinetics of the formation of the orthorhombic phase in EuRbFe4As4 crystals containing a large fraction of the EuFe2As2 phase has been studied using polarization optical microscopy. It is shown that the orthorhombic phase grows into the tetragonal one in stripes with the same crystallographic orientation, forming macro-domains. Then these domains abruptly penetrate parallel stripes of the orthorhombic phase of the second orientation, and 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, leading to spatial modulation of magnetic permeability. It has been found that even weak magnetic fields (up to 100 Oe) significantly affect the spatial distribution of the twin structure and have an effect similar to external stresses.

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Sobre autores

L. Uspenskaya

Osipyan Institute of Solid State Physics RAS

Autor responsável pela correspondência
Email: uspenska@issp.ac.ru
Rússia, 142432, Chernogolovka

M. Sidelnikov

Osipyan Institute of Solid State Physics RAS

Email: uspenska@issp.ac.ru
Rússia, 142432, Chernogolovka

K. Pervakov

Lebedev Physical Institute RAS

Email: uspenska@issp.ac.ru
Rússia, 119991, Moscow

V. Vlasenko

Lebedev Physical Institute RAS

Email: uspenska@issp.ac.ru
Rússia, 119991, Moscow

L. Vinnikov

Osipyan Institute of Solid State Physics RAS

Email: vinnik@issp.ac.ru
Rússia, 142432, Chernogolovka

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2. Fig. 1. Photographs of the surface of the EuFe2As2 single crystal obtained in reflected polarized light at 184.9 K and different orientations of the axes a and b (a, b) of the forming rhombic phase relative to the direction of polarization of the incident light: dark (1) and light (2) band contrasts, E – contour of the step on the plane where the transition takes place to the lower terrace of the surface.

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3. Fig. 2. Microdomains (A and B) of the bands of the forming rhombic phase at 184.7 K (a); the twin structure formed at 184.5 K, which practically persists with a further decrease in temperature (b).

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4. Fig. 3. The appearance of longitudinal and transverse brightness modulations of the image of the double structure of the rhombic phase (stresses) at a temperature of: a – 186.2; b – 33 K (contrast is changed to simultaneously visualize both the modulation and the double structure). It can be seen that the position of the twin boundaries is almost invariable over a wide temperature range.

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5. Fig. 4. The brightness profile measured in the transverse direction relative to the twin domains at 186.84 (1), 186.82 (2), 186.2 (3), 90.8 (4) and 14.7 K (5) (a); temperature dependence of the maximum (1) and minimum (2) brightness in the modulation bands, as well as the modulation amplitudes (3) (b).

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6. Fig. 5. The formation of a rhombic phase (white stripes) in one of the crystal regions at a temperature of: a – 186.84; b – 186.82 K (contrast transformation in the region of localization of the rhombic phase with simultaneous compression of the area occupied by this phase).

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7. Fig. 6. Transformation at T = 8 To macroscopic voltage modulation under the action of a magnetic field H = 50 E lying in the plane ab and applied at an angle of about 20 ° (a) and 70° (b) to the twin boundaries (the direction of the field is shown by black arrows, the direction of the crystallographic axes in the tetragonal phase is white arrows).

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