Adatom-adatom interaction mediated by an underlying surface phase transition

Physical Review Letters

Volumn 98, Issue 15, 2007, Pages

  Brihuega, I ^a   Cano, A ^a,b   Ugeda, M M ^a   Saenz J J ^a   Levanyuk, A P ^a   Gomez Rodriguez J M ^a  

^a UNIVERSIDAD AUTÓNOMA DE MADRID   (Spain)

^b INSTITUTO DE ASTROFÍSICA DE ANDALUCÍA CSIC   (Spain)

Author keywords

[No Author keywords available]

Indexed keywords

LEAD; LOW TEMPERATURE OPERATIONS; MOLECULAR INTERACTIONS; PHASE TRANSITIONS; SCANNING TUNNELING MICROSCOPY; SURFACE REACTIONS;

ADATOM-ADATOM INTERACTION; DISPLACEMENT PATTERNS; PB ADATOMS; SURFACE PHASE TRANSITION;

ADATOMS;

EID: 34247130585     PISSN: 00319007     EISSN: 10797114     Source Type: Journal    
DOI: 10.1103/PhysRevLett.98.156102     Document Type: Article

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30. From the comparison of experimental and theoretical data both for the displacements and the interaction energies we find that f=0.1eV/ and D=0.04eV/2. Very general arguments for structural phase transitions [see, e.g., V.G. Vaks, Sov. Phys. JETP 27, 486 (1968)] indicate that these parameters can be roughly estimated as f∼αEat/d and D∼Eat/d2, where Eat is an atomic energy, d represents an atomic distance, and α is a numerical coefficient indicating whether Pb adatoms can be considered as strong defects or weak ones. The order of magnitude of our parameters f and D is in tune with these estimates. SPHJAR 0038-5646