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Model of Subgrain Structure Formation in HTS Cuprates and Ferropnictides

  • Constantin G. Tretiatchenko (a1), Vassily L. Svetchnikov (a1) and Harold Wiesmann (a2)

Abstract

We have modified the model of rotational relaxation of stresses at mismatched interface by taking into account elastic strains of the growing film. This extended the model validity range to a wider class of compounds including pnictides. The model describes formation of low angle boundaries consisting of threading edge dislocations. Calculated interface energy shows that rotational relaxation occurs due to finite size of clusters and to non-equilibrium effect of the film growth. Subgrain size and expected angle of domain rotation depending on the lattice mismatch have been estimated. Unusual effect of increasing angle between the film subgrains at reduction of the deposition rate is predicted. The computed parameters of subgrains are consistent with the observed film nanostructure.

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1. Pan, V. M., Cherpak, Yu. V., Komashko, V. A., Pozigun, S. A., Tretiatchenko, C. G., Semenov, A. V., Pashitskii, E. A. and Pan, A. V., Phys. Rev. B 73 054508 (2006).
2. Svetchnikov, V., Pan, V., Traeholt, C. and Zandbergen, H., IEEE Trans. Appl. Supercond. 7 13961398 (1997).
3. Pan, V. M., Pashitskii, E. A., Ryabchenko, S. M., Komashko, V. A., Pan, A. V., Dou, S. X., Semenov, A. V., Tretiatchenko, C. G. and Fedotov, Yu. V., IEEE Trans. Appl. Supercond., 13 37143717 (2003).
4. Svetchnikov, V. L., Zandbergen, H. W. and Pan, V. M., Metallofiz. Nov. Tekh. 26, 725 (2004).
5. Svetchnikov, V. L. and Pan, V. M., Metallofiz. Nov. Tekh. 27 499 (2005).
6. Tretiatchenko, C. G., Flis, V. S., Svetchnikov, V. L. and Pan, V. M., MRS Proceedings 1367 mrss11-1367-vv08-03 (2011).
7. Bhadeshia, H. K. D. H., Worked examples in the geometry of crystals, 2 nd ed. (Institute of Materials, London, 2001 (updated 2006)) p. 76.

Keywords

Model of Subgrain Structure Formation in HTS Cuprates and Ferropnictides

  • Constantin G. Tretiatchenko (a1), Vassily L. Svetchnikov (a1) and Harold Wiesmann (a2)

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