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• W2034232852 endingPage "9291" @default.
• W2034232852 startingPage "9272" @default.
• W2034232852 abstract "We present results of synchrotron-x-ray-scattering studies of the orientational epitaxy exhibited by clean, hexagonally reconstructed Pt(001) and Au(001) surfaces. For the Pt(001) surface, a high-symmetry direction of the hexagonal overlayer is aligned with a high-symmetry direction of the bulk between 1820 and 1685 K. Between 1685 and ensuremath{sim}1580 K, the relative rotation angle varies continuously from 0ifmmode^circelsetextdegreefi{} to 0.75ifmmode^circelsetextdegreefi{} with a one-half-power-law dependence on the reduced temperature. At ensuremath{sim}1580 K, domains with a rotation angle of 0.8ifmmode^circelsetextdegreefi{} appear discontinuously, in coexistence with those with a rotation angle of 0.75ifmmode^circelsetextdegreefi{}. The two rotation angles reach ensuremath{sim}0.9ifmmode^circelsetextdegreefi{} and ensuremath{sim}0.75ifmmode^circelsetextdegreefi{} for the continuously and discontinuously rotated components, respectively, at 300 K. At all temperatures, the overlayer is incommensurate along both directions of the surface, with weakly temperature-dependent incommensurabilities. The areal density of the Pt(001) overlayer is compressed by ensuremath{sim}8% with respect to the hexagonal (111) planes in the bulk. In addition, the extent of translational order within the surface layer decreases with decreasing temperature. The Au(001) surface exhibits a strongly discontinuous rotational transformation at ensuremath{sim}980 K and there is coexistence between rotated and unrotated domains, in agreement with previous measurements. Rotated domains appear at a rotation angle of ensuremath{sim}0.8ifmmode^circelsetextdegreefi{} and their number grows with decreasing temperature at the expense of unrotated domains. Our measurements reveal the existence of additional favored rotation angles: one of 0.9ifmmode^circelsetextdegreefi{} and one that varies smoothly from 0ifmmode^circelsetextdegreefi{} to 0.5ifmmode^circelsetextdegreefi{}. The relative domain populations depend on temperature. A mean-field theory of rotational transformations, which accounts for the continuous rotational behavior of the Pt(001) surface, is presented, and it is shown that there are no corrections to mean-field behavior from fluctuations for a rotational transformation." @default.
• W2034232852 created "2016-06-24" @default.
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• W2034232852 date "1992-04-15" @default.
• W2034232852 modified "2023-10-15" @default.
• W2034232852 title "Orientational epitaxy and lateral structure of the hexagonally reconstructed Pt(001) and Au(001) surfaces" @default.
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• W2034232852 doi "https://doi.org/10.1103/physrevb.45.9272" @default.
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