The injection efficiency of spin-polarized quasi-particles in a superconducting Y-Ba-Cu-O (YBCO) film is investi-gated by means of current injection into the Nd0.7Sr0.3MnO3 /SrTiO3 /YBa2Cu3OT7-δ heterostructares. We ...The injection efficiency of spin-polarized quasi-particles in a superconducting Y-Ba-Cu-O (YBCO) film is investi-gated by means of current injection into the Nd0.7Sr0.3MnO3 /SrTiO3 /YBa2Cu3OT7-δ heterostructares. We have successfully prepared six injection junction windows in the YBCO thin film strip, which are all 56μm wide, but 80μm, 40μm, 20μm, 10μm, 5μm, and 2μm long, respectively. At 16K, our YBCO thin film strip (80nm thick) has Jc = 2 × 10^5A/cm^2. Under the spin-polarized injection current of Iinj= 0.5 mA, with decreasing injection junction length L, injection efficiency η (η = △Jc/△Jinj; △Jc: the suppression of critical current density due to finite △Jinj) increases gradually, until L is not more than 20μm. In that case, η hardly varies with the change of L, reaching up to about 6. We think that these results are related to the spin diffusion length of spin-polarized quasi-particles in the superconducting thin film. In our heterostructares, the YBCO thin film keeps good super-conductivity and the injection junction windows are of proper size, therefore, we have obtained relatively high injection efficiency of spin-polarized quasi-particles.展开更多
Superconducting thin films of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub>（Y-Ba-Cu-O） with Tc more than 85K have been deposited in situ by metalorganic chemical vapor deposition ...Superconducting thin films of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub>（Y-Ba-Cu-O） with Tc more than 85K have been deposited in situ by metalorganic chemical vapor deposition （MOCVD） on yttria stabilized zirconia（YSZ） substrates. The relationship of film orientation on substrate temperature and the lowest formation temperature region of superconducting phase have been obtained after changing the substrate temperature. The epitaxial relation between Y-Ba-Cu-O films and the YSZ su bstrates were discussed.展开更多
文摘The injection efficiency of spin-polarized quasi-particles in a superconducting Y-Ba-Cu-O (YBCO) film is investi-gated by means of current injection into the Nd0.7Sr0.3MnO3 /SrTiO3 /YBa2Cu3OT7-δ heterostructares. We have successfully prepared six injection junction windows in the YBCO thin film strip, which are all 56μm wide, but 80μm, 40μm, 20μm, 10μm, 5μm, and 2μm long, respectively. At 16K, our YBCO thin film strip (80nm thick) has Jc = 2 × 10^5A/cm^2. Under the spin-polarized injection current of Iinj= 0.5 mA, with decreasing injection junction length L, injection efficiency η (η = △Jc/△Jinj; △Jc: the suppression of critical current density due to finite △Jinj) increases gradually, until L is not more than 20μm. In that case, η hardly varies with the change of L, reaching up to about 6. We think that these results are related to the spin diffusion length of spin-polarized quasi-particles in the superconducting thin film. In our heterostructares, the YBCO thin film keeps good super-conductivity and the injection junction windows are of proper size, therefore, we have obtained relatively high injection efficiency of spin-polarized quasi-particles.
文摘Superconducting thin films of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub>（Y-Ba-Cu-O） with Tc more than 85K have been deposited in situ by metalorganic chemical vapor deposition （MOCVD） on yttria stabilized zirconia（YSZ） substrates. The relationship of film orientation on substrate temperature and the lowest formation temperature region of superconducting phase have been obtained after changing the substrate temperature. The epitaxial relation between Y-Ba-Cu-O films and the YSZ su bstrates were discussed.
