Phys. Rev. B 55, R716 - R720 (1997)Superconductor-insulator transition and the size effect on transport properties observedin ultrathin Y0.9Pr0.1Ba2Cu3Oy films
U. Kabasawa, T. Fukazawa, H. Hasegawa, Y. Tarutani, and K. Takagi
Transport properties of ultrathin Y0.9Pr0.1Ba2Cu3Oy films were studied as a function of thickness and length scale. Samples having planar YBa2Cu3Ox-ultrathin Y0.9Pr0.1Ba2Cu3Oy-YBa2Cu3Ox structures were used. The Y0.9Pr0.1Ba2Cu3Oy channel layer exhibited a superconductor-insulator (SI) transition when the film thickness was below ∼8 nm. The critical sheet conductance of the SI transition was near 4e2h. The sheet conductance of insulator-phase channels shorter than 10 μm was higher than that of 100-μm-long channels with the same thickness due to a size effect. The results suggest that a thickness-dependent correlation length may exist in the insulator-phase Y0.9Pr0.1Ba2Cu3Oy. ©1997 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevB.55.R716 [ Abstract | Previous article | Next article | Issue 2 ] |
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