Abstract
Microstructure deformation has been investigated for EuBa2Cu3Ox films associated with orthorhombic–tetragonal transition during cooling in an oxygen atmosphere. EuBa2Cu3Ox films have been grown by a pulsed laser deposition technique under 1000mTorr oxygen pressure and 800°C substrate temperature. After the growth, the films are cooled to 400°C and annealed in one atom oxygen pressure for 0–110h. The preferred orientation of the films is characterized by X-ray diffraction and ϕ-scan X-ray diffraction. Microstructures and lattice images of the EuBa2Cu3Ox films are observed by a transmission electron microscope. All of the obtained EuBa2Cu3Ox films are c-axis oriented. The ϕ-scan X-ray diffraction revealed that films without any 500°C annealing have a tetragonal structure. However, more than 3h annealed films are partly orthorhombic from the peak separation in the ϕ-scan. The angle between the two peaks is about 0.8°. We estimate the a-axis length/b-axis length ratio (orthorhombicity) from the angle between the separated peaks to be 0.866°. It agrees with the a-axis length/b-axis length ratio of well oxidized EuBa2Cu3Ox bulk materials.
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