Physics – Condensed Matter
Scientific paper
1995-02-06
Phys. Rev. Lett. 75, 4134 (1995); Erratum 76, 1984 (1996)
Physics
Condensed Matter
In this version, only few minor corrections and the update of references were done in order to make perfect correspondence wit
Scientific paper
10.1103/PhysRevLett.75.4134
We discuss the origin of the neutron scattering peak at 41 meV observed in YBa$_2$Cu$_3$O$_7$ below $T_c$. The peak may occur due to spin-flip electron excitations across the superconducting gap which are enhanced by the antiferromagnetic interaction between Cu spins. In this picture, the experiment is most naturally explained if the superconducting order parameter has $s$-wave symmetry and opposite signs in the bonding and antibonding electron bands formed within a Cu$_2$O$_4$ bilayer.
Mazin Igor I.
Yakovenko Victor M.
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