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1.
Wahl P Simon P Diekhöner L Stepanyuk VS Bruno P Schneider MA Kern K 《Physical review letters》2007,98(5):056601
The magnetic coupling between single Co atoms adsorbed on a copper surface is determined by probing the Kondo resonance using low-temperature scanning tunneling spectroscopy. The Kondo resonance, which is due to magnetic correlation effects between the spin of a magnetic adatom and the conduction electrons of the substrate, is modified in a characteristic way by the coupling of the neighboring adatom spins. Increasing the interatomic distance of a Cobalt dimer from 2.56 to 8.1 A we follow the oscillatory transition from ferromagnetic to antiferromagnetic coupling. Adding a third atom to the antiferromagnetically coupled dimer results in the formation of a collective correlated state. 相似文献
2.
3.
Diekhöner L Schneider MA Baranov AN Stepanyuk VS Bruno P Kern K 《Physical review letters》2003,90(23):236801
The electronic structure of thin Co nanoislands on Cu(111) has been investigated below and above the Fermi level (E(F)) by scanning tunneling spectroscopy at low temperature. Two surface related electronic states are found: a strong localized peak 0.31 eV below E(F) and a mainly unoccupied dispersive state, giving rise to quantum interference patterns of standing electron waves on the Co surface. Ab initio calculations reveal that the electronic states are spin polarized, originating from d3(z(2)-r(2))-minority and sp-majority bands, respectively. 相似文献
4.
Mironets O Meyerheim HL Tusche C Stepanyuk VS Soyka E Zschack P Hong H Jeutter N Felici R Kirschner J 《Physical review letters》2008,100(9):096103
Surface x-ray diffraction in combination with scanning tunneling microscopy and molecular dynamics calculations provide first quantitative evidence for unusually large relaxations in nanometer-sized Co islands deposited on Cu(001) at 170 K. These lead to sharply reduced interatomic Co distances as low as 2.36 A as compared to bulk Co (2.51 A) involving low symmetry Co adsorption sites. Our results prove the validity of the concept of mesoscopic mismatch which governs the strain relaxation of nanosized islands in general. 相似文献
5.
A. A. Vertiy S. P. Gavrilov I. V. Voynovskyy V. N. Stepanyuk Sunullah Ozbek 《International Journal of Infrared and Millimeter Waves》2002,23(10):1413-1444
In the present paper new results of modeling and experimental investigation on millimeter wave subsurface tomography are submitted. Tomographic algorithm is employed for imaging of subsurface objects in the case when conductivity of probed medium is not equal to zero. The possibilities and restrictions of this algorithm for image processing are shown both as a result of modeling and as a result of experiments. A new tomography setup allowing obtaining images of different inhomogeneities in dielectric media is considered. 相似文献
6.
N. A. Levanov A. A. Katsnel’son A. É. Moroz V. S. Stepanyuk W. Hergert K. Kokko 《Physics of the Solid State》1999,41(7):1216-1221
Small clusters of 3d metals Ni/Ni(001), Cu/Cu(001), 4d-Pd/Pd(001), Ag/Ag(001), 5d-Pt/Pt(001), and Au/Au(001) are investigated by semiempirical methods using multiparticle interatomic interaction potentials.
It is shown that the same magic numbers (4, 6, and 9) are characteristic for all metals indicated; these numbers are determined
by the symmetry characteristics of the clusters, related to the morphology of the fcc (001) substrate. It is shown for Pt/Pt(111)
that small clusters of seven, ten, and more atoms are stable for the fcc (111) surface. This confirms that the magic numbers
are associated with the symmetry of the clusters.
Fiz. Tverd. Tela (St. Petersburg) 41, 1329–1334 (July 1999) 相似文献
7.
We present a novel mechanism of nanostructure growth based on quantum confinement of surface-state electrons. Ab initio calculations and the kinetic Monte Carlo simulations reveal the phenomenon of confinement-induced adatom self-organization in quantum corrals. Our studies indicate that new atomic-scale nanostructures can be engineered exploiting the quantum confinement of surface electrons. 相似文献
8.
V.S. Stepanyuk D.I. Bazhanov A.N. Baranov W. Hergert A.A. Katsnelson P.H. Dederichs J. Kirschner 《Applied Physics A: Materials Science & Processing》2001,72(4):443-446
Structural relaxations in small Co islands on the Cu(001) surface are investigated performing atomistic calculations. We demonstrate
that the strain relief at the metal interface in the early stages of heteroepitaxy is more complicated than suggested by simple
considerations based on the small mismatch between the Co and Cu bulk metals. We found that the strain distribution in the
surface region near the islands varies strongly on an atomic scale. The effect of strain on the shape of the Co islands is
revealed. Diffusion on the top of strained islands and edge diffusion are considered.
Received: 10 April 2000 / Accepted: 15 May 2000 / Published online: 7 March 2001 相似文献
9.
The symmetric frequency domain problem for two ideally bonded elastic half-spaces with a perpendicular plane crack is considered. It is reduced to the boundary integral equation (BIE) with integration over the limited crack region. The contact conditions on the bimaterial interface are satisfied identically in the initial stage of obtaining the equation. After boundary element solution of the equation, the stress concentration in the vicinity of a penny-shaped crack under time-harmonic loading of constant amplitude is studied. The mode I stress intensity factors as functions of angular coordinate of a crack front point and wave number for various relations between the material parameters are computed. The crack depth relative to the bimaterial interface is determined, when the effect of the material dissimilarity on the crack can be neglected. 相似文献
10.
The problem of determining the effect of the media interface in a piecewise-homogeneous body on the stress concentration in
the vicinity of cracks located in one of the half-spaces is reduced to a system of two-dimensional singular equations of Newtonian
potential type. We study the effect of the relations of the elastic constants of the materials of a body composed of two half-spaces
on the stress intensity factors in the vicinity of a crack. We study different variants of the crack location relative to
the interface.
Translated fromMatematichni Metodi ta Fiziko-Mekhanichni Polya, Vol. 40, No. 2, 1997, pp. 64–69. 相似文献