F. Onufrieva, EVIDENCE FOR D(X2-Y2) SYMMETRY OF SUPERCONDUCTING ORDER-PARAMETER IN YBCO FROM NEUTRON-SCATTERING DATA, Physica. C, Superconductivity, 251(3-4), 1995, pp. 348-354
Symmetry of the superconducting order parameter in cuprates is analyze
d in relation with recent inelastic neutron-scattering data. It is sho
wn that the experimental results for YBa2Cu3O7-eta rule out the possib
ility of extended s wave pairing. On the contrary, the neutron scatter
ing data are in a very good agreement with d(x2-y2) symmetry of the su
perconducting order parameter. Since only these two candidates remain
after precise recent measurements of Josephson junctions, we conclude
that the symmetry of the superconducting order parameter in YBCO is d(
x2-y2).