YBa2Cu3O7-δ Superconductor-Insulator Composites — The Percolation Limit and Device Potential
The superconducting properties of composites formed in the series YBa2Cu3Ox-Y2BaCuOy have been extensively investigated. These materials, formed along a tie-line in the phase diagram are intrinsically two-phase, with the ratios of the two phases established by the working composition.
Since the (211) compound is intrinsically an insulator, by varying the composition we have been able to reach the percolation limit and establish the behaviour of both the inter-and intra-granular behaviour independently. The dependence of the V-i characteristics have been used to establish a number of devices and the tunnelling spectroscopy observations show clear evidence for an unusual series of transitions at high voltages.
KeywordsCritical Current Density Resistive Transition Convergence Point Normal State Resistivity Full Connectivity
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