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April 18, 2026Applied Physics Letters

Structural uniformity and grain formation in inch-scale few-layer YBa2Cu3O7 − x epitaxial films on MgO

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Authors

SYShuaishuai YinRWR WANGZhejiang Sci-Tech UniversityZFZhongpei FengSongshan Lake Materials Laboratory

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Implication

This systematic study uncovers grain formation and structural variations in YBCO films on MgO, suggesting new optimization paths.

Key Points

  • To investigate the structural uniformity and grain formation in YBa2Cu3O7−x films on MgO substrates during initial growth stages.
  • Conducted synchrotron x-ray crystal truncation rod measurements
  • Performed three-dimensional reciprocal space mapping on a 2-in. YBCO film
  • Assessed spatial homogeneity and grain texture across the film
  • Observed significant quality variation from the center to the edge of the film
  • Found predominantly c-axis-oriented R0° grains in ultra-thin YBCO films
  • Extracted lattice parameters close to those of bulk YBCO, indicating relaxed strain
  • Identified interfacial effects at YBCO/MgO as a major factor in early grain formation

Cite This Study

Yin et al. (2026) studied this question.

synapsesocial.com/papers/69e320cc40886becb653ff17https://doi.org/10.1063/5.0314409
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