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Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>La</mml:mtext><mml:mn>2</mml:mn></mml:msub></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>CuO</mml:mtext><mml:mn>4</mml:mn></mml:msub></mml:math>
We study the zero-point and thermal ionic motion in ${\text{La}}_{2}$${\text{CuO}}_{4}$ by means of high-resolution neutron-diffraction experiments. Our results demonstrate anisotropic motion of O and, to a lesser extent, Cu ions, both consistent with the structure of coupled ${\text{CuO}}_{6}$ octahedra, and quantify the relative effects of zero-point and thermal contributions to …