Condensed Matter Physics, 2014, vol. 17, No. 3, p. 33401:110
DOI:10.5488/CMP.17.33401
Title:
Selforganization of adatom adsorption structure at interaction with tip of dynamic force microscope
Author(s):

A.V. Khomenko
(Department of Complex Systems Modelling, Sumy State University, 2 RimskiiKorsakov St., 40007 Sumy, Ukraine; Peter Grünberg Institut1, ForschungszentrumJülich, 52425 Jülich, Germany)

The formation of an adatom adsorption structure in dynamic force microscopy experiment is shown as a result of the spontaneous appearance of shear strain caused by external supercritical heating. This transition is described by the KelvinVoigt equation for a viscoelastic medium, the relaxation LandauKhalatnikov equation for shear stress, and the relaxation equation for temperature. It is shown that these equations formally coincide with the synergetic Lorenz system, where the shear strain acts as the order parameter, the conjugate field is reduced to the stress, and the temperature is the control parameter. Within the adiabatic approximation, the steadystate values of these quantities are found. Taking into account the sample shear modulus vs strain dependence, the formation of the adatom adsorption configuration is described as the firstorder transition. The critical temperature of the tip linearly increases with the growth of the effective value of the sample shear modulus and decreases with the growth of its typical value.
Key words:
phase transition, rheology, plasticity, strain, stress, atomic force microscopy
PACS:
46.55.+d, 64.60.i, 61.72.Hh, 62.20.F, 62.20.Qp, 68.37.Ps
