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41 results on '"Gayone, J. E."'

1. Strong spin-orbit splitting on Bi surfaces

Author

Koroteev, Yu. M., Bihlmayer, G., Gayone, J. E., Chulkov, E. V., Bluegel, S., Echenique, P. M., and Hofmann, Ph.

Subjects
Condensed Matter - Other Condensed Matter
Abstract

Using first-principles calculations and angle-resolved photoemission, we show that the spin-orbit interaction leads to a strong splitting of the surface state bands on low-index surfaces of Bi. The dispersion of the states and the corresponding Fermi surfaces are profoundly modified in the whole surface Brillouin zone. We discuss the implications of these findings with respect to a proposed surface charge density wave on Bi(111) as well as to the surface screening, surface spin-density waves, electron (hole) dynamics in surface states, and to possible applications to the spintronics., Comment: 4 pages 2 figures

Published
2004
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10. Final state effects on photoemission line shapes at finite temperatures

Author

Sondergaard, Ch, Hofmann, Ph, Schultz, Ch, Moreno, S, Gayone, J. E., VINCENTE ALVAREZ, M. A., Zampieri, G, Lizzit, S, Baraldi, Alessandro, Sondergaard, Ch, Hofmann, Ph, Schultz, Ch, Moreno, S, GAYONE J., E, VINCENTE ALVAREZ M., A, Zampieri, G, Lizzit, S, and Baraldi, Alessandro

Published
2001

14. Strong spin-orbit splitting on Bi surfaces

Author

Universidad del País Vasco, Ministerio de Ciencia y Tecnología (España), Eusko Jaurlaritza, Max Planck Society, Danish Natural Science Research Council, Koroteev, Yuri M., Bihlmayer, Gustav, Gayone, J. E., Chulkov, Eugene V., Blügel, S., Echenique, Pedro M., Hofmann, Ph., Universidad del País Vasco, Ministerio de Ciencia y Tecnología (España), Eusko Jaurlaritza, Max Planck Society, Danish Natural Science Research Council, Koroteev, Yuri M., Bihlmayer, Gustav, Gayone, J. E., Chulkov, Eugene V., Blügel, S., Echenique, Pedro M., and Hofmann, Ph.

Abstract

Using first-principles calculations and angle-resolved photoemission, we show that the spin-orbit interaction leads to a strong splitting of the surface-state bands on low-index surfaces of Bi. The dispersion of the states and the corresponding Fermi surfaces are profoundly modified in the whole surface Brillouin zone. We discuss the implications of these findings with respect to a proposed surface charge density wave on Bi(111) as well as to the surface screening, surface spin-density waves, electron (hole) dynamics in surface states, and to possible applications to the spintronics.

Published
2004

18. Evidence against a charge density wave on Bi(111)

Author

Kim, T. K., primary, Wells, J., additional, Kirkegaard, C., additional, Li, Z., additional, Hoffmann, S. V., additional, Gayone, J. E., additional, Fernandez-Torrente, I., additional, Häberle, P., additional, Pascual, J. I., additional, Moore, K. T., additional, Schwartz, A. J., additional, He, H., additional, Spence, J. C. H., additional, Downing, K. H., additional, Lazar, S., additional, Tichelaar, F. D., additional, Borisenko, S. V., additional, Knupfer, M., additional, and Hofmann, Ph., additional

Published
2005
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35. Building two-dimensional metal-organic networks with tin

Author

Rodriguez, L. M., Fuhr, J. D., Machain, P., Ascolani, H., Lingenfelder, M., and Gayone, J. E.

Subjects
tcnq, au(111), electronic-structure, charge-transfer, layers
Abstract

We show that Sn atoms combined with organic ligands can be used to build 2D coordination networks on Au(111) surfaces.

39. Mn–Cu Transmetalation as a Strategy for the Assembly of Decoupled Metal–Organic Networks on Sn/Cu(001) Surface Alloys

Author

Alberto Verdini, Silvia Carlotto, J. E. Gayone, S. Schneider, A. Cossaro, Magalí Lingenfelder, P. Machaín, Maurizio Casarin, Hugo Ascolani, Luca Floreano, J. D. Fuhr, Ascolani, H., Machain, P., Fuhr, J. D., Schneider, S., Carlotto, S., Casarin, M., Cossaro, A., Verdini, A., Floreano, L., Lingenfelder, M., and Gayone, J. E.

Subjects
TCNQ, Materials science, MANGANESO, STM, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, purl.org/becyt/ford/1 [https], Metal, Transmetalation, Reactivity (chemistry), Physical and Theoretical Chemistry, elettra, coordination structures, Deposition (law), SUPERFICIES, photoemission, purl.org/becyt/ford/1.3 [https], COORDINACIÓN, 021001 nanoscience & nanotechnology, Copper, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, phthalocyanine, General Energy, chemistry, Chemical engineering, visual_art, visual_art.visual_art_medium, 0210 nano-technology, COORDINATION STRUCTURES, PHTHALOCYANINE, ELETTRA
Abstract

Surface alloying of Cu(001) by Sn deposition is a finely controllable method of tuning the degree of copper reactivity in order to drive the on-surface assembly and synthesis of metal-organic coordination networks. In this work we show that the (32×2)R45° reconstruction of the Sn/Cu(001) surface alloy acts as a weakly interacting substrate ideal for the assembly of rectangular metal-organic networks based on transition metals. As a demonstration, we have grown a two-dimensional coordination network formed by manganese and TCNQ (7,7,8,8-tetracyanoquinodimethane) with 1:1 stoichiometry. In contrast with the same structure grown on Au(111), the use of the Sn/Cu(001) substrate enables a commensurate structure with larger and more regular ordered domains. We show that the formation of a Cu-TCNQ coordination network and subsequent Mn-Cu transmetalation reactions are the key steps of the growth mechanism. Moreover, ab initio density-functional calculations indicate that the system studied in the present work is a unique example of a metal-organic coordination network weakly interacting with the substrate. Fil: Machain, Paloma. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Fuhr, Javier Daniel. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro; Argentina Fil: Schneider, S.. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina Fil: Carlotto, Silvia. Università di Padova; Italia Fil: Casarin, M.. Università di Padova; Italia Fil: Cossaro, A.. No especifíca; Fil: Verdini, A.. No especifíca; Fil: Floreano, L.. No especifíca; Fil: Lingenfelder, Magalí Alejandra. École Polytechnique Fédérale de Lausanne; Suiza Fil: Gayone, Julio Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología - Nodo Bariloche | Comisión Nacional de Energía Atómica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología - Nodo Bariloche; Argentina Fil: Ascolani, Hugo del Lujan. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología - Nodo Bariloche | Comisión Nacional de Energía Atómica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología - Nodo Bariloche; Argentina

Published
2020

40. Ubiquitous deprotonation of terephthalic acid in the self-assembled phases on Cu(100)

Author

Luis M. Rodríguez, Luca Floreano, A. Cossaro, Lucila J. Cristina, Alberto Verdini, Hugo Ascolani, B. Quiroga Argañaraz, J. E. Gayone, J. D. Fuhr, Quiroga Arganaraz, B., Cristina, L. J., Rodriguez, L. M., Cossaro, A., Verdini, A., Floreano, L., Fuhr, J. D., Gayone, J. E., and Ascolani, H.

Subjects
Física Atómica, Molecular y Química, Cu(100), TEREPHTHALIC ACID, Ciencias Físicas, General Physics and Astronomy, Protonation, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, DFT, CU(100), purl.org/becyt/ford/1 [https], chemistry.chemical_compound, Deprotonation, XPS, Molecule, Reactivity (chemistry), Carboxylate, Physical and Theoretical Chemistry, SELF-ASSEMBLY, Hydrogen bond, SURFACES, terephthalic acid, Intermolecular force, purl.org/becyt/ford/1.3 [https], 021001 nanoscience & nanotechnology, 0104 chemical sciences, Crystallography, chemistry, Density functional theory, 0210 nano-technology, CIENCIAS NATURALES Y EXACTAS
Abstract

We performed an exhaustive study of terephthalic acid (TPA) self-assembly on a Cu(100) surface, where first-layer molecules display two sequential phase transitions in the 200-400 K temperature range, corresponding to different stages of molecular deprotonation. We followed the chemical and structural changes by means of high-resolution X-ray photoelectron spectroscopy (XPS) and variable-temperature scanning tunneling microscopy (STM), which were interpreted on the basis of density functional theory (DFT) calculations and photoemission simulations. In order to reveal the spectroscopic contributions of the molecules in different states of deprotonation, we modified the substrate reactivity by deposition of a small amount of Sn, which hampers the deprotonation reaction. We found that the characteristic molecular ribbons of the TPA/Cu(100) α-phase at a low temperature contain a significant fraction of partially deprotonated molecules, in contrast to the expectation of a fully protonated phase, where the self-assembly was claimed to be simply driven by the intermolecular double hydrogen bonds [OH⋯O]. On the basis of our simulations, we propose a model where the carboxylate groups of the partially deprotonated molecules form single hydrogen bonds with the carboxylic groups of the fully protonated molecules. Using real time XPS, we also monitored the kinetics of the deprotonation reaction. We show that the network of mixed single and double hydrogen bonds inhibits further deprotonation up to ∼270 K, whereas the isolated molecules display a much lower deprotonation barrier. Fil: Quiroga Argañaraz, Maria Bernarda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina Fil: Cristina, Lucila Josefina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto de Física del Sur. Universidad Nacional del Sur. Departamento de Física. Instituto de Física del Sur; Argentina Fil: Parra Rodríguez, Laura María. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina Fil: Cossaro, A.. Consiglio Nazionale delle Ricerche; Italia Fil: Verdini, A.. Consiglio Nazionale delle Ricerche; Italia Fil: Floreano, L.. Consiglio Nazionale delle Ricerche; Italia Fil: Fuhr, Javier Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina Fil: Gayone, Julio Esteban. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina Fil: Ascolani, Hugo del Lujan. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina

Published
2018

41. Stabilization of high-spin Mn ions in tetra-pyrrolic configuration on copper

Author

Luca Floreano, J. E. Gayone, J. D. Fuhr, Albano Cossaro, Magalí Lingenfelder, Alberto Verdini, Silvia Carlotto, Maurizio Casarin, Hugo Ascolani, Carlotto, S., Fuhr, J. D., Cossaro, A., Verdini, A., Casarin, M., Lingenfelder, M., Gayone, J. E., Floreano, L., and Ascolani, H.

Subjects
basis-sets, Materials science, Absorption spectroscopy, high spin mn, General Physics and Astronomy, chemistry.chemical_element, metal-organic networks, 02 engineering and technology, Electronic structure, 010402 general chemistry, 01 natural sciences, electronic-properties, NEXAFS, chemistry.chemical_compound, Transmetalation, High spin Mn, Mn-TCNQ network, ROCIS method, Sn-Cu alloying, x-ray-absorption, Reactivity (chemistry), rocis method, sn-cu alloying, complexes, nexafs, exchange, Substrate (chemistry), mn-tcnq network, transition, Surfaces and Interfaces, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Copper, XANES, 0104 chemical sciences, Surfaces, Coatings and Films, Crystallography, phthalocyanine, chemistry, Phthalocyanine, 0210 nano-technology
Abstract

By means of Mn-Cu transmetalation, we incorporated Mn atoms in an array of TCNQ (7,7,8,8-tetracyanoquinodimethane) grown on Cu(100), forming a long range ordered and commensurate metal–organic coordination network (MOCN). Preliminary Sn alloying of the Cu(100) surface allowed us to control the degree of substrate reactivity, thus preventing the chemical interaction of the Mn-TCNQ MOCN with the substrate. Mn 2 + ions are stabilized in an artificial tetra-pyrrolic coordination, which mimics the macrocyle configuration of Mn-phthalocyanines/porphyrins. X-ray absorption spectroscopy at the Mn L 2 , 3 -edge indicates that the Mn ions are in a high-spin state (S = 5/2), in agreement with DFT + U calculations which also shows that the electronic structure of this Mn-TCNQ MOCN is very similar to that of the corresponding unsupported MOCN.

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