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EXPERIMENTAL CONSTRAINTS ON THE PAIRING STATE OF THE CUPRATE SUPERCONDUCTORS: AN EMERGING CONSENSUS
Physical Properties of High Temperature Superconductors V
We present a critical discussion of recent experimental probes of the pairing state of the high temperature superconductors, focusing primarily, but not exclusively, on \Yba, where the best data currently exist. Penetration depth measurements near \Tc\ give no indication of an extra transition, indicating that the pairing state is a one-dimensional representation of the crystal symmetry. Penetration depth measurements at low temperatures provide strong evidence for a change in sign of the gapdoi:10.1142/9789814261289_0006 fatcat:u4d5kpwiwfg6lk32ifalggwwhe