Gamma-ray irradiation effects of as-grown Bi-Sr-Ca-Cu-O thin films on the superconducting property and modulation periodicity

As-grown crystalline Bi 2Sr 2CaCu 2O 8 films were prepared on MgO(100) substrates by the MOCVD method and were sequentially irradiated with γ-rays up to 400 MRad. On irradiating with γ-rays, the lattice parameter a(= b) decreased, and the superconducting transition temperature and the modulation per...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1994-07, Vol.228 (3), p.379-382
Main Authors: Ishibashi, T., Yoda, O., Goda, S.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
High-tc films
Physics
Superconducting films and low-dimensional structures
Superconductivity
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Summary:As-grown crystalline Bi 2Sr 2CaCu 2O 8 films were prepared on MgO(100) substrates by the MOCVD method and were sequentially irradiated with γ-rays up to 400 MRad. On irradiating with γ-rays, the lattice parameter a(= b) decreased, and the superconducting transition temperature and the modulation periodicity both increased with increasing irradiation up to 250 MRad. By irradiation with 250 MRad, the film exhibited the highest superconducting transition temperatures of 85 and 43 K for T c onset and T c end temperatures, respectively. The T c onset temperature was found to increase with increasing modulation periodicity, suggesting that the T c onset increased with decreasing excess oxygen in the BiO layers.
ISSN:0921-4534
1873-2143
DOI:10.1016/0921-4534(94)90429-4