Critical current anisotropy and pinning in (103) YBCO superconducting thin films on SrTiO3(110) substrates

Wu, Kaung‐Hsiung; Huang, S. J.; Wang, Shih Jung; Chen, S. P.; Juang, Jenh‐Yih; Uen, T. M.; Gou, Y. S.

doi:10.1007/bf02563003

Cited by 2 publications

(1 citation statement)

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“…Cuprate high T c thin films which have the crystallographic c-axis at an angle to the substrate normal offer a number of interesting properties [1,2]: they may present a longer coherence length to an adjacent layer; they may display a large 'Seebeck' response to laser illumination [3]; they may allow relatively easy phase slip compared to c-axis normal films easing the need for sub-micron patterning and the specifications for edge definition [4].…”

Section: Introductionmentioning

confidence: 99%

Helical current flow along twist boundaries in YBCO thin films

Campion¹,

Fletcher²,

King³

et al. 1998

Supercond. Sci. Technol.

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Current may flow in helical paths along the boundary between two tilted anisotropic conductors in circumstances when current flow in either conductor alone is restrained by the extreme anisotropy. We are able to explain number of features of the electrical properties of (103)/(013) oriented thin films deposited onto (110) substrates in terms of helical current paths involving the twist boundaries. These include the absence of weak link behaviour in the superconducting state for current flow along the substrate direction, the temperature dependence of the normal state resistivity for current flow in that direction, and the normal state electrical anisotropy. We predict that there are circumstances where currents will preferentially circulate around the boundaries of a tilt domain. The existence of these natural conduction loops may explain the period of recently observed quantum-interference behaviour in these films.

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Section: Introductionmentioning

confidence: 99%