Transport and Morphological Characteristics of Thin YBa2Cu3O7 – x Films Obtained by Pulsed Laser Deposition with Velocity Filtration of the Laser Erosion Plume

• Published in: Physics of the solid state Vol. 63; no. 9; pp. 1378 - 1386
• Main Authors: Il’in, A. I., Ivanov, A. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.09.2021; Springer Nature B.V
• Subjects: Crystal structure; Filtration; Flat surfaces; Frequency ranges; Lasers; Physics; Physics and Astronomy; Pulsed laser deposition; Pulsed lasers; Room temperature; Solid State Physics; Substrates; Thickness; Thin films; Transport properties; YBCO superconductors; transport characteristics of films; film evolution; pulsed laser deposition; surface relief; SrTiO
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S1063783421090122

The variation of parameters of pulsed laser deposition with velocity filtration of an erosion plume in the frequency range of 4–33 Hz with different times of deposition on SrTiO 3 (100) substrates at 730–750°C and different velocities of filtered particles was used to vary the characteristics of the R ( T ) dependence of YBa 2 Cu 3 O 7 –   x films with thicknesses of 150–200 nm. Deposition with a laser plume filtration frequency of about 30 Hz form a flat surface with a room temperature resistance that is twice as high as in films obtained without filtration, which implies the absence of easy transport paths for holes in the ab plane. A superconducting transition width Δ T of 2.5–2.9 K and T ( R = 0) of up to 85.8 K are found with oxygen index y = 6.85, which corresponds to the characteristics of good films with this thickness. The oxygen index in the films is found to be higher (6.85–7.04) and lower (6.85–6.8) at filtering frequencies of 18–4.5 and 21–33 Hz, respectively. A study of the surface by scanning electron microscopy makes it possible to reveal the rearrangement of the crystal structure during deposition and its effect on the transport characteristics of the films.