Title :
Variation of LaSrCuO film temperature during pulsed laser deposition on LaSrGaO substrate
Author :
Buzea, C. ; Myoren, H. ; Wang, H.B. ; Nakajima, K. ; Yamashita, T.
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
By using a conventional laser ablation system, LSCO thin films were deposited on LaSrGaO/sub 4/(100) substrates in an oxygen environment. During deposition the temperature of the film surface was measured with an infrared pyrometer. The measured temperature decreases following the exponential law of radiation absorption in a material. The experimental results indicate an increase of the deviation from the exponential law with decreasing oxygen pressure in the chamber. The conclusion of this experiment reveals the fact that either the refraction index of the deposited material may vary nonuniformly or the deposition velocity is not a constant during laser ablation.
Keywords :
high-temperature superconductors; lanthanum compounds; pulsed laser deposition; refractive index; strontium compounds; superconducting thin films; (LaSr)/sub 2/CuO/sub 4/; LaSrGaO/sub 4/; LaSrGaO/sub 4/(100) substrate; exponential radiation absorption law; film surface temperature; nonconstant deposition velocity; oxygen environment; oxygen pressure dependence; pulsed laser deposition; refraction index nonuniform variation; Laser ablation; Laser sintering; Laser theory; Optical materials; Optical pulses; Pulsed laser deposition; Sputtering; Substrates; Superconductivity; Temperature measurement;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
