Atomic structure of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Eu</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Si</mml:mi><mml:mrow><mml:mo>(</mml:mo><mml:mn>111</mml:mn><mml:mo>)</mml:mo></mml:mrow><mml:mspace width="0.2em" /><mml:mn>3</mml:mn><mml:mo>×</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>5</mml:mn><mml:mo>×</mml:mo><mml

Kuzmin, M.; Laukkanen, P.; Perälä, R.E.; Vaara, R.-L.; Väyrynen, I. J.

doi:10.1103/physrevb.71.155334

Cited by 15 publications

(16 citation statements)

References 35 publications

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“…From a scientific point of view, these 1D structures have attracted much attention due to the possibility of observing various exotic physical phenomena, such as formations of non-Fermi-liquid-like ground states, Peierls-like phase transitions, or order-disorder transitions. [1][2][3][4][5][6] The 1D and quasi-1D reconstructions formed by the adsorption of rare-earth metals ͑REMs͒ on a Si͑111͒ surface [7][8][9][10][11][12][13][14][15][16] are candidates for such 1D systems.…”

Section: Introductionmentioning

confidence: 99%

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Structural investigation of the quasi-one-dimensional reconstructions induced by Eu adsorption on a Si(111) surface

2005

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The surface structures of the ͑quasi-͒one-dimensional reconstructions induced by the adsorption of Eu on Si͑111͒ have been investigated by low-energy electron diffraction ͑LEED͒ and high-resolution core-level photoelectron spectroscopy. Different phases were observed in LEED depending on the Eu coverage. The lowest coverage phase has a ͑3 ϫ 2͒ periodicity, and the highest coverage phase has a ͑2 ϫ 1͒ one. Of the intermediate phases, the LEED pattern of the so-called ͑5 ϫ 1͒ surface indicates that this surface has actually a ͑5 ϫ 4͒ periodicity. The Eu 4f core-level spectra show that the Eu coverages of the ͑3 ϫ 2͒, ͑5 ϫ 4͒, and ͑2 ϫ 1͒ phases are 1 / 6 monolayer ͑ML͒, 0.3 ML, and 0.5 ML, respectively, and that the valence state of the adsorbate is 2+ in all these three phases. In the Si 2p core-level spectra, three surface components were observed in both the lowest and highest coverage phases. By considering the energy shift and intensity of each surface component, we conclude that the structure of the ͑3 ϫ 2͒ phase is basically the same as that of the honeycomb-chain-channel model, and that the ͑2 ϫ 1͒ phase is formed by -bonded Seiwatz Si chains. Regarding the ͑5 ϫ 4͒ phase, two extra Si 2p surface components were observed together with the three components observed in the two end phases. Taking the energy shifts and intensities of the extra surface components into account, we propose a structural model of the ͑5 ϫ 4͒ phase.

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Section: Introductionmentioning

confidence: 99%

“…[10][11][12][13][14] Of these reconstructions, the lowest coverage ͑3 ϫ 2͒ phase has been proposed to have the same atomic structure as that of alkaline-earth metal ͑AEM͒ induced Si͑111͒-͑3 ϫ 2͒ surface [17][18][19][20][21][22][23][24][25] in Refs. 11-15.…”

Section: Introductionmentioning

confidence: 99%

Structural investigation of the quasi-one-dimensional reconstructions induced by Eu adsorption on a Si(111) surface

2005

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“…1͑a͔͒. [8][9][10][11]14,[18][19][20][21][22] The surface electronic structures of the Eu-and Ca-induced ͑3 ϫ 2͒ phases resemble closely not only each other, but also the surface electronic structure of a Liinduced Si͑111͒-͑3 ϫ 1͒ HCC surface, [18][19][20][21][22] and support indirectly the proposed structural model. Regarding the highestcoverage phase, the basic atomic structures of both the Euand Ca-induced ͑2 ϫ 1͒ phases have been proposed to follow the Seiwatz structure 23 illustrated by the model in Fig.…”

Section: Introductionmentioning

confidence: 64%

“…[7][8][9][10][11] The Ca/ Si͑111͒ surface has been reported to form quasi-1D and 1D reconstructions that are quite similar to those formed by Eu. [12][13][14] Of these reconstructions, the atomic structure of the lowest-coverage ͑3 ϫ 2͒ phase has been proposed to be basically the same as that of the honeycomb-chain-channel ͑HCC͒ model [15][16][17] for both the Eu-and Ca-induced phases ͓Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Further, although the atomic structures of these intermediate phases are considered to be basically formed by combinations of the HCC and Seiwatz structures, 9-14 different structural models have been proposed for the so-called ͑5 ϫ 1͒ phase. Structural models with a periodicity of ͑5 ϫ 2͒ and adsorbate coverages of 0.4 monolayer ͑ML͒ or 1 / 3 ML have been proposed for the Eu-and Ca-induced reconstructions, 10,14 and a model with a ͑5 ϫ 4͒ periodicity and an adsorbate coverage of 1 / 3 ML has been proposed for the Eu-induced reconstruction.…”

Section: Introductionmentioning

confidence: 99%

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Surface electronic structures of the Eu- and Ca-induced so-calledSi(111)−(5×1)reconstructions

et al. 2006

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We have investigated the electronic structures of the so-called Eu-and Ca-induced Si͑111͒-͑5 ϫ 1͒ surfaces by using angle-resolved photoelectron spectroscopy ͑ARPES͒ and low-energy electron diffraction ͑LEED͒. The LEED patterns of these surfaces indicate that the periodicities of both surfaces are actually ͑5 ϫ 4͒. In the ARPES study, seven surface states were observed on each ͑5 ϫ 4͒ reconstruction. Of these surface states, the dispersions of five of them show good agreement with those of the Eu-and Ca-induced ͑3 ϫ 2͒ honeycombchain-channel ͑HCC͒ surfaces and the dispersions of the two other states agree well with those of the Eu-and Ca-induced ͑2 ϫ 1͒ Seiwatz surfaces along the ͓110͔ direction-i.e., the direction parallel to the adsorbate chain. Taking the dispersion behavior of these surface states into account, we conclude that the interaction between the nearest-neighbor HCC chain and Seiwatz chain is quite small and that the electronic structure of one chain hardly affects the electronic structure of its neighboring chain. We also discuss the atomic structure of the Eu-and Ca-induced Si͑111͒-͑5 ϫ 1͒ reconstructions based on their electronic structures.

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