Raman study of laser irradiation effects on YBa2Cu3O7-x thin films

Xianbin Wang*, Z. X. Shen, S. Y. Xu, C. K. Ong, M. H. Kuok, S. H. Tang

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    3 Scopus citations

    Abstract

    The effects of laser irradiation on high-temperature superconducting YBa2Cu3O7-x thin films have been investigated by micro-Raman spectroscopy. Laser heating affects YBa2Cu3O7-x thin films to varying degrees at different laser power levels. For a laser power density below 1 mW μm-2, laser irradiation causes only thermal expansion within the focused area. When the laser power density is increased to about 1.7 mW μm-2, oxygen out-diffusion occurs. The orthorhombic to tetragonal structural phase transition was observed at 3.1 mW μm-2. Above 4.3 mW μm-2, chemical decomposition is inferred from the appearance of Raman bands due to the impurity phase BaCuO2. Comparison between the laser-heated results and the furnace-heated results was made, and the role played by temperature gradient and stress in the laser-heated sample is discussed in detail.

    Original languageEnglish (US)
    Pages (from-to)1017-1022
    Number of pages6
    JournalSuperconductor Science and Technology
    Volume13
    Issue number7
    DOIs
    StatePublished - Jul 1 2000

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Condensed Matter Physics
    • Metals and Alloys
    • Materials Chemistry
    • Electrical and Electronic Engineering

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