H. Hancotte et al., TUNNELING IN PURE AND SUBSTITUTED SINGLE-CRYSTALS OF BI2SR2CA1CU2O8- S+D-WAVE PAIRING AND GAP ENHANCEMENT(X ), Physica. C, Superconductivity, 282, 1997, pp. 1487-1488
The presence of a d(90%) + s(10%) symmetry of the order parameter and
a Ni induced enhancement of the superconducting coupling mechanism in
bismuth cuprates is deduced from tunneling spectroscopy measurements u
sing STM and Break-junction techniques.