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Title: Reflection high-energy positron diffraction study on Si(111)-{radical}(3)x{radical}(3)-Ag surface

Abstract

We carried out a reflection high-energy positron diffraction study on a Si(111)-{radical}(3)x{radical}(3)-Ag surface at temperatures ranging from 50 to 800 K. We found that the rocking curves obtained both below and above the critical temperature of the phase transition (T{sub c}) can be explained with the inequivalent triangle (IET) model by introducing an order parameter between the IET(+) and IET(-) phases. We determined the length and rotation angle of the Ag triangle to be 2.76{+-}0.02 A and 5.3{+-}0.5 deg., respectively. We also determined the surface parallel and normal Debye temperatures of the topmost Ag atoms to be 110 and 140 K, respectively. We found that the temperature dependence of the total reflection intensities below T{sub c} can be completely reproduced by considering the order-disorder phase transition for a critical exponent of {beta} given by 0.28{+-}0.05.

Authors:
; ;  [1];  [2]
  1. Advanced Science Research Center, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292 (Japan)
  2. (Japan) and Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo 112-8681 (Japan)
Publication Date:
OSTI Identifier:
20957783
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 75; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevB.75.115424; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRITICAL TEMPERATURE; DEBYE TEMPERATURE; ELECTRON DIFFRACTION; LENGTH; NEUTRON DIFFRACTION; ORDER PARAMETERS; ORDER-DISORDER TRANSFORMATIONS; POSITRONS; REFLECTION; RINGS; ROTATION; SEMICONDUCTOR MATERIALS; SILICON; SILVER; SURFACES; TEMPERATURE DEPENDENCE

Citation Formats

Fukaya, Y., Kawasuso, A., Ichimiya, A., and Advanced Science Research Center, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292. Reflection high-energy positron diffraction study on Si(111)-{radical}(3)x{radical}(3)-Ag surface. United States: N. p., 2007. Web. doi:10.1103/PHYSREVB.75.115424.
Fukaya, Y., Kawasuso, A., Ichimiya, A., & Advanced Science Research Center, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292. Reflection high-energy positron diffraction study on Si(111)-{radical}(3)x{radical}(3)-Ag surface. United States. doi:10.1103/PHYSREVB.75.115424.
Fukaya, Y., Kawasuso, A., Ichimiya, A., and Advanced Science Research Center, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292. Thu . "Reflection high-energy positron diffraction study on Si(111)-{radical}(3)x{radical}(3)-Ag surface". United States. doi:10.1103/PHYSREVB.75.115424.
@article{osti_20957783,
title = {Reflection high-energy positron diffraction study on Si(111)-{radical}(3)x{radical}(3)-Ag surface},
author = {Fukaya, Y. and Kawasuso, A. and Ichimiya, A. and Advanced Science Research Center, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292},
abstractNote = {We carried out a reflection high-energy positron diffraction study on a Si(111)-{radical}(3)x{radical}(3)-Ag surface at temperatures ranging from 50 to 800 K. We found that the rocking curves obtained both below and above the critical temperature of the phase transition (T{sub c}) can be explained with the inequivalent triangle (IET) model by introducing an order parameter between the IET(+) and IET(-) phases. We determined the length and rotation angle of the Ag triangle to be 2.76{+-}0.02 A and 5.3{+-}0.5 deg., respectively. We also determined the surface parallel and normal Debye temperatures of the topmost Ag atoms to be 110 and 140 K, respectively. We found that the temperature dependence of the total reflection intensities below T{sub c} can be completely reproduced by considering the order-disorder phase transition for a critical exponent of {beta} given by 0.28{+-}0.05.},
doi = {10.1103/PHYSREVB.75.115424},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 11,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}