Vibrations of small cobalt clusters on low-index surfaces of copper: Tight-binding simulations

Borisova, S. D.; Eremeev, S. V.; Rusina, G. G.; Stepanyuk, V. S.; Bruno, P.; Chulkov, Eugene V.

doi:10.1103/physrevb.78.075428

Cited by 28 publications

(13 citation statements)

References 72 publications

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“…As will be shown in the following, the spectrum experimentally recorded on a clean and topographically flat terrace using a copper terminated tip clearly indicates that features characteristic of the lattice dynamics of a clean Cu͑111͒ surface 19,20 are superimposed to phonon modes typical of small metal clusters. This copper surface is an ideal system to study the influence of the tip as the phonon spectrum of the surface is featureless in the low-energy range where the metal clusters show characteristic vibrational modes.…”

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confidence: 73%

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Inelastic electron tunneling spectroscopy: A route to the identification of the tip-apex structure

et al. 2010

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The vibrational spectrum of a tunneling junction on a clean Cu͑111͒ surface has been characterized by vibrational density of states calculations and inelastic electron tunneling spectroscopy technique. We demonstrate that the achieved spectrum consists not only of vibrational modes excited by the tunneling electrons on the clean surface but also of modes characteristic of the structure of the tip apex. This allows to identify unequivocally the atomic structure of the tip, which is still the largest unknown parameter in a scanning tunneling microscope. This opens a new perspective in the interpretation of the measurements of vibrational modes with a scanning tunneling microscope. Additionally, it might have implications in the measurements of electron conductance through single atom or molecules contacted by the tip of scanning tunneling microscope.

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confidence: 73%

“…As low-energy inelastic excitations are characteristic of small clusters of atoms, 20 the vibrational spectrum of a single copper atom adsorbed onto the Cu͑111͒ surface, as schematically drawn in the upper part of panel ͑b͒, has been calculated. The predicted vibration spectrum projected as in-plane and out-of-plane lattice displacement is shown in Fig.…”

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confidence: 99%

Inelastic electron tunneling spectroscopy: A route to the identification of the tip-apex structure

et al. 2010

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“…For instance, 174 (out of a total number of 180) vibration modes of C 60 exhibit energies exceeding 25 meV and are thus higher than typical metal phonon energies. In contrast, the single metal adatom have vibrational energies 90 that match the phonon energies of the electrodes. As a consequence, heat dissipation to the substrate is more effective for the adatom than for the molecule, which may explain the lower effective temperature of the adatom.…”

Section: Resultsmentioning

confidence: 99%

Conductance of Ag atoms and clusters on Ag(111): Spectroscopic and time‐resolved data

Sperl¹,

Berndt²

2010

Physica Status Solidi (b)

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The evolution of the electronic structure of linear atomic Ag chains on Ag(111) has been explored atom by atom using lowtemperature scanning tunnelling microscopy and spectroscopy. Electronic states confined to the linear chains are well described within a particle-in-a-box model. The evolution of an unoccupied Ag monomer resonance during the synthesis of an Ag dimer reveals that the Ag-Ag interaction is predominantly direct owing to the large spatial extension of p wave functions of the adsorbed atoms. The hopping dynamics of a single Ag atom adsorbed on Ag(111) have been monitored by time-resolved two-level conductance fluctuations of the tunnel junctions. Effective temperatures of the junction and diffusion barrier heights in the presence of the tip were extracted from a voltage-dependent analysis of the fluctuation rate.

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“…Based on these results, we can suggest that Co is rejected from the Cu core and forms islands or a shell of the bcc Cu particles. It should be noted that the experimental [67] and theoretical [68,69] studies also demonstrated the formation of compact Co clusters or islands on the fcc Cu surfaces.…”

Section: Cobalt Segregationmentioning

confidence: 93%

First principle study of cobalt impurity in bcc Fe with Cu precipitates

et al. 2012

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The addition of cobalt was experimentally observed to increase the strength and impact toughness of Cu precipitation hardened steel. In order to understand the mechanism of this strengthening, we studied the effect of cobalt in the bulks and surfaces of bcc Fe and bcc Cu, as well as at the Fe/Cu interface by ab initio density-functional approach. We investigated the cobalt distribution between the Fe matrix and Cu precipitate, and found that cobalt is rejected from the core of the Cu particle. The calculated elastic constants and stacking fault energies show that cobalt does not produce any solid solution softening or hardening in bcc Fe. However, cobalt segregated in the interfacial region increases the cleavage fracture energies and cleavage stress of the Fe/Co/Cu interface. The compressive stress, which arises near the interface due to strong Fe-Co bonds, may serve as a barrier for dislocation motion through the interface resulting in additional hardening.

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Vibrations of small cobalt clusters on low-index surfaces of copper: Tight-binding simulations

Cited by 28 publications

References 72 publications

Inelastic electron tunneling spectroscopy: A route to the identification of the tip-apex structure

Inelastic electron tunneling spectroscopy: A route to the identification of the tip-apex structure

Conductance of Ag atoms and clusters on Ag(111): Spectroscopic and time‐resolved data

First principle study of cobalt impurity in bcc Fe with Cu precipitates

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