Incommensurate structures in a BaMo(110) system: influence of temperature and frozen defects

Klimenko, E.V.; Litvinova, E.M.; Lyuksyutov, I. F.; Наумовец, А.Г.; Zasimovich, I.N.

doi:10.1016/0039-6028(92)90880-f

Cited by 14 publications

(5 citation statements)

References 24 publications

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“…According to this model the density ∆ρ i of the additional interstitials should obey the Arrhenius law, namely ∆ρ i ∝ exp[−∆ /T ]. This has been verified in an experiment on the system Ba/Mo(110) [4] and the value of ∆ = ˜ w −˜ p has been measured. According to ref.…”

supporting

confidence: 56%

“…Thus in the limit n → 0 the phase with point-like defects only is thermodynamically preferable over a hexagonal DW lattice. Domain wall evaporation has been observed in the systems Ba/Mo(110) [4] and Te/Mo(110) [5]. In the system Ba/Mo(110) [4] the period of the DW lattice increases with temperature.…”

mentioning

confidence: 97%

“…Domain wall evaporation has been observed in the systems Ba/Mo(110) [4] and Te/Mo(110) [5]. In the system Ba/Mo(110) [4] the period of the DW lattice increases with temperature. This increase has been successfully described by a model, in which the adatoms from DWs form additional interstitials (DW evaporation).…”

mentioning

confidence: 97%

“…On the contrary, the problem of the influence of thermally excited point defects like vacancies or interstitials on the DW system remains almost unexplored. Recently the DW evaporation into a gas of interstitials has been observed experimentally in the systems Ba/Mo(110) [4] and Te/Mo(110) [5] (see discussion below).…”

mentioning

confidence: 99%

“…According to ref. [4], ∆ ≈ 3T m , where T m ≈ 500 K is the melting temperature of the commensurate structure. This result is consistent with the expected relation between ∆ and T m .…”

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confidence: 99%

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Incommensurate-commensurate transition via domain wall evaporation in an overlayer

1996

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A new mechanism is proposed in a two-dimensional system for the transition from an incommensurate phase containing walls of striped symmetry to a commensurate phase via evaporation of the domain walls into a gas of point-like defects (PD). The point-like defect can be a vacancy, interstitial or a composite defect like domain wall loop. The precise nature of the PD is not important in the limit of vanishing DW density. The incommensurate-commensurate transition via domain wall evaporation (DWE transition) occurs under the condition of fixed overlayer coverage, and can be of either first or second order. We study the possible types of the phase diagram in the case of DWE. Experimental examples are discussed. In the case of the second-order DWE transition the domain wall density ρ w behaves near Tc like ρw ∝ (Tc − T ).

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confidence: 56%

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confidence: 97%

mentioning

confidence: 97%

mentioning

confidence: 99%

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confidence: 99%

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