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PreprintCC BY 4.0arXiv

In Situ Thermal Preparation by CO2-Laser and Chemical Characterization of Oxide Substrates Across Multiple Crystallographic Orientations

  • Neethu Rose Leyo
  • Sethulakshmi Sajeev
  • Arnaud P. Nono Tchiomo
  • Prosper Ngabonziza
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Abstract

Atomically flat and chemically controlled oxide substrate surfaces are essential for high-quality epitaxial growth of complex materials and heterostructures. Previous studies have demonstrated in situ thermal preparation of selected oxide substrates, primarily focusing on conventional low-index orientations such as SrTiO3 (100) and LaAlO3 (100). Here, we extend these methodologies to a broader range of oxide substrates and crystallographic orientations, including challenging polar surfaces. We present a systematic study of the in situ thermal preparation of SrTiO3 (100), SrTiO3 (111), GdScO3 (110), LaAlO3 (111), (LaAlO3)0.3(Sr2AlTaO6)0.7 (001), and NdGaO3 (110) single crystal substrates. The substrates are annealed in a vacuum chamber under a controlled oxygen background environment using a CO2 laser heating system. The optimized annealing conditions produce atomically flat step-and-terrace structures, long-range surface crystallinity, and effectively clean surfaces across all the investigated substrates. Our results establish a versatile, reproducible, and broadly applicable platform for the in situ preparation of oxide substrates immediately prior to epitaxial growth. These results also provide practical guidelines for interface engineering and surface-sensitive investigations of complex materials.

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Cite

BibTeXRIS
BibTeX
@misc{leyo2026situ,
  title = {{In Situ Thermal Preparation by CO$_2$-Laser and Chemical Characterization of Oxide Substrates Across Multiple Crystallographic Orientations}},
  author = {Neethu Rose Leyo and Sethulakshmi Sajeev and Arnaud P. Nono Tchiomo and Prosper Ngabonziza},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.27428},
  eprint = {2610.27428},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.27428},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - In Situ Thermal Preparation by CO_2-Laser and Chemical Characterization of Oxide Substrates Across Multiple Crystallographic Orientations
AU  - Neethu Rose Leyo
AU  - Sethulakshmi Sajeev
AU  - Arnaud P. Nono Tchiomo
AU  - Prosper Ngabonziza
PY  - 2026
DA  - 2026/10/20
PB  - arXiv
DO  - 10.48550/arxiv.2610.27428
UR  - https://arxiv.org/abs/2610.27428
AB  - Atomically flat and chemically controlled oxide substrate surfaces are essential for high-quality epitaxial growth of complex materials and heterostructures. Previous studies have demonstrated in situ thermal preparation of selected oxide substrates, primarily focusing on conventional low-index orientations such as SrTiO_3 (100) and LaAlO_3 (100). Here, we extend these methodologies to a broader range of oxide substrates and crystallographic orientations, including challenging polar surfaces. We present a systematic study of the in situ thermal preparation of SrTiO_3 (100), SrTiO_3 (111), GdScO_3 (110), LaAlO_3 (111), (LaAlO_3)_0.3(Sr_2AlTaO_6)_0.7 (001), and NdGaO_3 (110) single crystal substrates. The substrates are annealed in a vacuum chamber under a controlled oxygen background environment using a CO_2 laser heating system. The optimized annealing conditions produce atomically flat step-and-terrace structures, long-range surface crystallinity, and effectively clean surfaces across all the investigated substrates. Our results establish a versatile, reproducible, and broadly applicable platform for the in situ preparation of oxide substrates immediately prior to epitaxial growth. These results also provide practical guidelines for interface engineering and surface-sensitive investigations of complex materials.
ER  -