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Temperature-dependent X-ray absorption spectra of the hole-doped La2−xSrxCuO4 and electron-doped Nd2−xCexCuO4−δ high-temperature superconductors were investigated above the Cu K absorption edge. We observed strong anharmonicity in the superconductive CuO2 plane. For x=0.15 it was shown that part of oxygen ions oscillate...
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