Energy Gap Structure in Bilayer Oxide Superconductors

Details Energy Gap Structure in Bilayer Oxide Superconductors Energy Gap Structure in Bilayer Oxide Superconductors

1995-01-09

arxiv.org/abs/cond-mat/9501030v2

Physics

Condensed Matter

4 pages, Revtex, 1 figure. The discussion of the phase mode has been extended.

Scientific paper

10.1143/JPSJ.64.3179

We consider a model for bilayer superconductors where an interlayer pairing amplitude $\Delta_\perp$ co-exists with intralayer pairing $\Delta_\|$ of $d_{x^2 - y^2}$ symmetry. This model is motivated by a recent photoemission experiment reporting the splitting of the nodes of the energy gap. In addition to offering a natural explanation of this observation, the model has a number of new experimental consequences. We find that the new state is accompanied by a spontaneous breaking of the tetragonal symmetry. We also find that the out-of-phase oscillation of $\Delta_\perp$ and $\Delta_\|$ gives rise to a new Raman active mode. The phase of $\Delta_\perp$ may also become imaginary, leading to a state which breaks time reversal symmetry, which may have important implications for tunnelling experiments.

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