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Relation between surface stress and (1 x 2) reconstruction for (1 1 0) fcc transition metal surfaces

机译:(1 1 0)fcc过渡金属表面的表面应力与(1 x 2)重构之间的关系

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In this work we question the validity of surface stress relief as a driving force for surface reconstruction in the particular case of the (1 1 0) face of fcc transition metals. To this aim, we calculate within tight-binding second moment potential, both surface energy and surface stress before and after the (1 x 2) missing row reconstruction. Doing that, one indeed checks that reconstruction is energetically favourable for Au and Pt and not for Ni and Cu as experimentally seen, but we also find that it enhances surface stress along the dense direction for all the elements and along the less dense direction for those which reconstruct. Therefore, surface stress relief is definitely not the driving force for this reconstruction.
机译:在这项工作中,我们质疑表面应力消除作为fcc过渡金属(1 1 0)面的特殊情况下表面重建的驱动力的有效性。为此,我们在紧束缚的第二矩电势内,计算(1 x 2)缺失行重构前后的表面能和表面应力。这样做,确实可以检查到重建在能量上对Au和Pt有利,而不是对Ni和Cu的实验性发现,但是我们还发现,它沿所有元素的密集方向和不那么密集的方向增强了表面应力。重建。因此,表面应力消除绝对不是该重建的驱动力。

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