Normal state properties of high angle grain boundaries in (Y,Ca)Ba2Cu3O7-delta

Details Normal state properties of high angle grain boundaries in (Y,Ca)Ba2Cu3O7-delta Normal state properties of high angle grain boundaries in (Y,Ca)Ba2Cu3O7-delta

2004-08-31

arxiv.org/abs/cond-mat/0409004v1

Physics

Condensed Matter

Superconductivity

17 pages, 1 table, 5 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.71.094509

By lithographically fabricating an optimised Wheatstone bridge geometry, we have been able to make accurate measurements of the resistance of grain boundaries in Y1-xCaxBa2Cu3O7-d between the superconducting transition temperature, Tc, and room temperature. Below Tc the normal state properties were assessed by applying sufficiently high currents. The behaviour of the grain boundary resistance versus temperature and of the conductance versus voltage are discussed in the framework charge transport through a tunnel barrier. The influence of misorientation angle, oxygen content, and calcium doping on the normal state properties is related to changes of the height and shape of the grain boundary potential barrier.

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