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Phys. Rev. Lett. 46, 1465–1468 (1981)

Critical Exponents of a Four-State Potts Chemisorbed Overlayer: p(2×2) Oxygen on Ni(111)

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L. D. Roelofs*, A. R. Kortan†, T. L. Einstein, and Robert L. Park
Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742

Received 29 December 1980; published in the issue dated 1 June 1981

We report the first determination of critical exponents for a chemisorbed overlayer, using low-energy electron diffraction. We examine the order-disorder transition of p(2×2) oxygen on the (111) surface of nickel. This study is the first of critical behavior of a two-dimensional system in the four-state Potts universality class. From measured diffraction-beam profiles, we extract the exponents β, γ, and ν. Discussion of disparity between our results and predicted exponents considers several possibilities, including logarithmic corrections.

© 1981 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.46.1465
DOI:
10.1103/PhysRevLett.46.1465
PACS:
64.70.-p, 61.14.Hg, 64.60.Fr, 68.90.+g

*Present address: Physics Department, Brown University, Providence, R.I. 02912.

†Present address: Physics Department, Massachusetts Institute of Technology, Cambridge, Mass. 02139.

See Also

Comment: M. Schick, Oxygen on Ni(111): A Transition of the Heisenberg Model with Cubic Anisotropy, Phys. Rev. Lett. 47, 1347 (1981).

Comment: Fereydoon Family, Transition in Random Four-State Potts Model and Oxygen on Ni(111), Phys. Rev. Lett. 48, 367 (1982).

Reply: L. D. Roelofs, N. C. Bartelt, and T. L. Einstein, Roelofs, Bartelt, and Einstein Respond, Phys. Rev. Lett. 47, 1348 (1981).

 
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