Anisotropy of the resistivity and critical current density of porous vicinal YBa(2)Cu(3)O(7-delta) films

作者：Emergo R L S^*; Wu J Z; Haugan T J; Barnes P N

来源：Superconductor Science and Technology, 2008, 21(8): 085008.

DOI：10.1088/0953-2048/21/8/085008

The anisotropy of electrical transport properties of YBa(2)Cu(3)O(7-delta) (YBCO) films containing high density nanopores grown on 5 degrees, 10 degrees and 20 degrees vicinal substrates was investigated. For porous films in the normal state, the resistivity in the longitudinal direction is comparable to that of reference YBCO films without nanopores. In addition, the rho(c)/rho(ab) ratios derived from the resistivities in longitudinal and transverse directions of the porous samples fall in the same range as that of twinned single crystal YBCO. For the superconducting state, the pore surfaces provide strong magnetic pins to magnetic vortices, which leads to significantly increased critical current density J(c) along the longitudinal direction as compared to that of the reference YBCO films. This strong isotropic pore surface pinning also increased the J(c) along the transverse direction as compared to that of nonporous vicinal YBCO films.

• 出版日期2008-8