ANISOTROPIC MICROSTRAIN AND ITS RELATIONSHIP WITH THE OUT-OF-PLANE TEXTURE AND THE SUPERCONDUCTING PROPERTIES OF YBCO FILMS GROWN ONTO SRTIO3 (100) AND LAALO3 (100) SUBSTRATES BY CHEMICAL SOLUTION DEPOSITION

Sanchez H.E.; Kargin J.B.; Afanasyev D.A.; Guchenko S.A.; Sagyndykova G.E.; Zhangozin K.N.; Bustamante Dominguez A.; Celis Rojas S.R.; Barnes C.H.W.; de Los Santos Valladares L. · Eurasian Physical Technical Journal (2026) · DOI: 10.31489/2026n3/44-53

Resumen

The anisotropic microstrain and its relationship with the out-of-plane texture and superconducting properties of YBa2Cu3O7 - δ (YBCO) films grown onto SrTiO3 (100) and LaAlO3 (100) single-crystal substrates by the chemical solution deposition sol-gel technique are considered. X-ray diffraction analysis present (001) reflections from the YBCO phase in both films, with c-axis grain fraction values of 88 and 81 for the SrTiO3 and LaAlO3, respectively. The ω-scan measurements around the (005) reflection reveal a multi-layer structure for both films: three sub-layers with Δω = 0.35°, 0.83° and 1.0° for YBCO/SrTiO3, and two sub-layers with Δω = 0.45° and 2.0° for YBCO/LaAlO3. Microstructural analysis using Debye-Scherrer and Williamson-Hall methods indicates that the YBCO films exhibit significant anisotropic microstrain, with the strain state being more homogeneous on LaAlO3 than on SrTiO3. The superconducting properties show a strong dependence on microstrain: The YBCO film on LaAlO3 exhibit a higher onset critical temperature (TC(Onset)≈ 92 K) compared to that grown onto SrTiO3 (TC(Onset)≈ 78 K), despite the latter having a higher degree of c-axis texture. This work demonstrates that anisotropic microstrain plays a dominant role in determining the superconducting properties of YBCO films grown by the chemical solution deposition technique, highlighting that structural texture alone is not the only factor governing superconducting performance. Copyright (c) 2026 Eurasian Physical Technical Journal This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. https://creativecommons.org/licenses/by-nc-nd/4.0/

Instituciones: Universidad Nacional Mayor de San Marcos; Universidad Nacional de Barranca