Abstract

Phase-sensitive tests of pairing symmetry have provided strong evidence for predominantly d-wave pairing symmetry in both the hole- and electron-doped high-T c cuprate superconductors. Temperature dependent measurements in YBa 2Cu 3O 7-σ (YBCO) indicate that the d-wave pairing dominates, with little if any imaginary component, at all temperatures from 0.5K through T c. In this article we review some of this evidence and discuss the implications of the universal d-wave pairing symmetry in the cuprates.

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