New relaxation phenomena in the outer atomic layers of Fe{211} |
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Authors: | J. Sokolov H.D. Shih U. Bardi F. Jona P.M. Marcus |
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Affiliation: | Department of Materials Science and Engineering, State University of New York Stony Brook, New York 11794, U.S.A.;IBM Research Center, P.O. Box 218, Yorktown Heights, New York 10598, USA |
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Abstract: | A low-energy electron diffraction analysis of a {211} surface of body-centered cubic iron reveals relaxations in the directions perpendicular and parallel to the surface plane. Both relaxations alternate in successive layers. The perpendicular relaxation goes from contraction of 10.5% to expansion of 5% to contraction of 1%. The parallel relaxation goes from a shift of the first layer of 0.24Å (10% of the nearest neighbor distance) toward more symmetrical registration with the second layer, to an opposite shift of 0.035 Å of the second layer with respect to the third. |
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