We have calculated zone-boundary phonons in La2-xBaxCuO4 for x = 0 up to x = 0.4. In case of x = 0.1 a strongly anharmonic potential for the oxygen Cu-O bond-stretching mode in the CuO2 plane at the N point was found. We therefore predict a softening similar to the experimental findings recently observed in Sr-doped La2CuO4. [References: 4]
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