Abstract
We have applied the potential-induced breathing model, a nonempirical ionic model, to La/sub 2/CuO/sub 4/. The ionic model predicts the observed tetragonal-to-orthorhombic distortion, predicts a lower-symmetry ground state, and predicts a stable oxygen breathing mode. We find unstable phonon branches that we relate to phase transitions. Harmonically unstable double-well modes will couple to the charge density in the copper-oxide planes and possibly contribute to high-T/sub c/ superconductivity. This ionic coupling is not included in recent calculations.
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