EuBa_2Cu_3O_<7-δ> Thin Films Grown on Sapphires with Epitaxial CeO_2 Buffer Layers
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概要
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Epitaxial growth of CeO_2 films on Al_2O_3 (11^^-02) substrates and the effect of CeO_2 buffer layers on the growth orientation and superconducting properties of EuBa_2Cu_3O_<7-δ> (EBCO) were investigated. CeO_2 and EBCO films were prepared by rf and dc magnetron sputtering, respectively, and were characterized by X-ray diffraction (θ-2θ scan and φ scan), atomic force microscopy (AFM) and high resolution scanning electron microscopy. Epitaxial (001) CeO_2 films were obtained at an off-center distance (D_<on-off>) of 3.5 cm and a substrate temperature of 660℃. The structural and superconducting properties of EBCO films deposited at 650℃ depended on the thickness of the CeO_2 buffer layer. The EBCO films deposited on CeO_2 50-400-Å-thick buffer layers had T_<ce>'s of 9O K or above. The high-T_c EBCO films had in-plane epitaxial orientation relationships of Al_2O_3 [112^^-0] ⫽ CeO_2[100] ⫽ EBCO[110]. The EBCO films on the thin CeO_2 buffer layers had rectangular grains similar to those on MgO(001) substrates. The critical current density of the EBCO films with T_<ce> = 90 K was about 6×10^5 A/cm^2 in zero field at 77.3 K. The T_<ce> varied largely and decreased with increasing CeO_2 buffer layer thickness above 500 Å. AFM observation of a 1000-Å-thick CeO_2 film showed growth of bamboo-like crystal grains 1700 Å long and 300 Å wide along the direction of CeO_2 [110]. The ravine depths were about 100 Å. The EBCO films on the thick CeO_2 buffer layer (> 500 Å) exhibited poor superconducting behavior and gave (103) or (110) diffraction peaks.
- 社団法人応用物理学会の論文
- 1997-05-15
著者
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Wakana Hironori
Faculty Of Engineering Iwate University
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Kashiwaba Yasube
Faculty of Engineering, Iwate University
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Wakana H
Iwate Univ. Morioka‐shi Jpn
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Michikami O
Iwate Univ. Morioka‐shi Jpn
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Michikami Osamu
Faculty Of Engineering Iwate University
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Kashiwaba Yasube
Faculty Of Engineering Iwate University
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Yokosawa Atsushi
Faculty of Engineering, Iwate University
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Yokosawa Atsushi
Faculty Of Engineering Iwate University
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