Abstract
A new experimental method to judge the symmetry of the order parameter in high- T c superconductivity is proposed. The interference of reflected holes from different directions due to the Andreev reflection causes quite different phenomena among s -, d x 2 - y 2 - and d x y -wave superconductivity. It is shown that this interference effect may be observed as a change of the conductance below T c , which enables us to identify the symmetry of the pairing state in high- T c superconductivity. Various cases in which the experimental setup deviates from the ideal situation are also studied and experimental condition for this method is clarified.
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