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

Journal Article · Thu Mar 15 00:00:00 EDT 2007 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.75.115424· OSTI ID:20957783

Fukaya, Y; Kawasuso, A; Ichimiya, A ^[1]

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1. Advanced Science Research Center, Japan Atomic Energy Agency, 1233 Watanuki, Takasaki, Gunma 370-1292 (Japan)

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.

• OSTI ID: 20957783
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 75, Issue 11; Other Information: DOI: 10.1103/PhysRevB.75.115424; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

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