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

Abstract

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.

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

References in corpus (3)

• Nanoscale Phase Separation in Colossal Magnetoresistance Materials: A Lesson for the Cuprates?
• The Normal State Resistivity of Grain Boundaries in YBa2Cu3O7-delta
• Electronic Transport through YBCO Grain Boundary Interfaces between 4.2 K and 300 K

Cited by in corpus (5)

• Charge expulsion, charge inhomogeneity and phase separation in dynamic Hubbard models
• Quantitative calculations of charge carrier densities in the depletion layers at YBa2Cu3O7-x interfaces
• Quantum metrology with quantum Wheatstone bridge composed of Bose systems
• Resonance phenomena in asymmetric superconducting quantum interference devices
• Formation of magnetic moments and resistance upturn at grain boundaries of two-dimensional electron systems