Spin Tuning of Electron-Doped Metal-Phthalocyanine Layers
| Autor: | Cornelius Krull, J.J. Kavich, Pietro Gambardella, Paolo Moras, Polina M. Sheverdyaeva, Gustavo Ceballos, Carlo Carbone, Julio C. Cezar, Alberto Lodi Rizzini, Sebastian Stepanow, F. Yakhou-Harris, Aitor Mugarza |
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| Přispěvatelé: | Ministerio de Ciencia e Innovación (España), Generalitat de Catalunya, European Commission, Competence Centre for Materials Science and Technology (Switzerland), European Synchrotron Radiation Facility, Swiss National Science Foundation |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Ligand field theory
Indoles Absorption spectroscopy Spin states Metal ions in aqueous solution Inorganic chemistry Electrons Isoindoles Circular dichroism Biochemistry Catalysis Metal Molecular magnet chemistry.chemical_compound Colloid and Surface Chemistry Organic-based magnets Oxidation state Microscopy Scanning Tunneling Magnetic characteristic Metals Heavy Organometallic Compounds Adsorbate-substrate Magnetic moment Alkali metal doping Metals Alkali Circular Dichroism Magnetic Phenomena General Chemistry X-Ray Absorption Spectroscopy chemistry visual_art Phthalocyanine visual_art.visual_art_medium Physical chemistry Alkali-metal adsorption Orbital magnetic moment Condensed Matter::Strongly Correlated Electrons Magnetic configuration |
| Zdroj: | Journal of the American Chemical Society 136 (2014): 5451–5459. doi:10.1021/ja501204q info:cnr-pdr/source/autori:Sebastian Stepanow, Alberto Lodi Rizzini, Cornelius Krull, Jerald Kavich, Julio C. Cezar, Flora Yakhou-Harris, Polina M. Sheverdyaeva, Paolo Moras, Carlo Carbone, Gustavo Ceballos, Aitor Mugarza, Pietro Gambardella/titolo:Spin Tuning of Electron-Doped Metal-Phthalocyanine Layers/doi:10.1021%2Fja501204q/rivista:Journal of the American Chemical Society (Print)/anno:2014/pagina_da:5451/pagina_a:5459/intervallo_pagine:5451–5459/volume:136 Digital.CSIC. Repositorio Institucional del CSIC instname Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona Recercat: Dipósit de la Recerca de Catalunya Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) Recercat. Dipósit de la Recerca de Catalunya |
| Popis: | The spin state of organic-based magnets at interfaces is to a great extent determined by the organic environment and the nature of the spin-carrying metal center, which is further subject to modifications by the adsorbate-substrate coupling. Direct chemical doping offers an additional route for tailoring the electronic and magnetic characteristics of molecular magnets. Here we present a systematic investigation of the effects of alkali metal doping on the charge state and crystal field of 3d metal ions in Cu, Ni, Fe, and Mn phthalocyanine (Pc) monolayers adsorbed on Ag. Combined X-ray absorption spectroscopy and ligand field multiplet calculations show that Cu(II), Ni(II), and Fe(II) ions reduce to Cu(I), Ni(I), and Fe(I) upon alkali metal adsorption, whereas Mn maintains its formal oxidation state. The strength of the crystal field at the Ni, Fe, and Mn sites is strongly reduced upon doping. The combined effect of these changes is that the magnetic moment of high- and low-spin ions such as Cu and Ni can be entirely turned off or on, respectively, whereas the magnetic configuration of MnPc can be changed from intermediate (3/2) to high (5/2) spin. In the case of FePc a 10-fold increase of the orbital magnetic moment accompanies charge transfer and a transition to a high-spin state. © 2014 American Chemical Society. We acknowledge support from Ministerio de Ciencia e Innovacion (MAT2010-15659), Agència de Gestió ́d’Ajuts Universitaris i de Recerca (2009 SGR 695), the European Research Council (StG 203239 NOMAD), the Swiss Competence Centre for Materials Science and Technology (CCMX), and the ESRF for the provision of beamtime. J.K. acknowledges funding through the National Science Foundation International Research Fellowship. |
| Databáze: | OpenAIRE |
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