Abstract
The spin-polarized quasiparticles injection in YBCO film has been studied by means of current injection into NdSrMnO / SrTiO / YBaCuO heterostructures. Six injection junction windows are all 56μm wide, but 80μm, 40μm, 20μm, 10μm, 5μm, and 2μm long, respectively. Under I inj=0.5 Ma , injection efficiency η increases gradually with the decrease of injection junction length L, but η hardly varies when L is less than 20ηm. ηmax is more than 6. These experiment results are related with the spin diffusion length of spin-polarized quasiparticles in a-b plane of YBCO film. "Current-adding principle" would be used carefully to explain the experiment phenomena.
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