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A Detailed Experimental and Theoretical Study into the Properties of C60 Dumbbell Junctions

Authors

  • Katalin Gillemot,

    1. Department of Physics, Lancaster University, Lancaster, LA1 4YB, UK
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  • Charalambos Evangeli,

    1. Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia, Condensada Módulo 13, Universidad Autónoma de Madrid, E-28049, Madrid, Spain
    2. Instituto Universitario de Ciencia de Materiales, ‘Nicolás Cabrera’, Spain
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  • Edmund Leary,

    Corresponding author
    1. Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia, Condensada Módulo 13, Universidad Autónoma de Madrid, E-28049, Madrid, Spain
    2. Instituto Madrileño de Estudios Avanzados (IMDEA), Calle Faraday 9, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
    3. Instituto Universitario de Ciencia de Materiales, ‘Nicolás Cabrera’, Spain
    • Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia, Condensada Módulo 13, Universidad Autónoma de Madrid, E-28049, Madrid, Spain.

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  • Andrea La Rosa,

    1. Departamento de Química Orgánica, Facultad de Química, Universidad Complutense de Madrid, E-28040, Madrid, Spain
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  • M. Teresa González,

    1. Instituto Madrileño de Estudios Avanzados (IMDEA), Calle Faraday 9, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
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  • Salvatore Filippone,

    1. Departamento de Química Orgánica, Facultad de Química, Universidad Complutense de Madrid, E-28040, Madrid, Spain
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  • Iain Grace,

    1. Department of Physics, Lancaster University, Lancaster, LA1 4YB, UK
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  • Gabino Rubio-Bollinger,

    1. Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia, Condensada Módulo 13, Universidad Autónoma de Madrid, E-28049, Madrid, Spain
    2. Instituto Universitario de Ciencia de Materiales, ‘Nicolás Cabrera’, Spain
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  • Jaime Ferrer,

    1. Deparamento de Física, Universidad de Oviedo, Spain
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  • Nazario Martín,

    1. Departamento de Química Orgánica, Facultad de Química, Universidad Complutense de Madrid, E-28040, Madrid, Spain
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  • Colin J. Lambert,

    1. Department of Physics, Lancaster University, Lancaster, LA1 4YB, UK
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  • Nicolás Agraït

    1. Laboratorio de Bajas Temperaturas, Departamento de Física de la Materia, Condensada Módulo 13, Universidad Autónoma de Madrid, E-28049, Madrid, Spain
    2. Instituto Madrileño de Estudios Avanzados (IMDEA), Calle Faraday 9, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain
    3. Instituto Universitario de Ciencia de Materiales, ‘Nicolás Cabrera’, Spain
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Abstract

A combined experimental and theoretical investigation is carried out into the electrical transport across a fullerene dumbbell one-molecule junction. The newly designed molecule comprises two C60s connected to a fluorene backbone via cyclopropyl groups. It is wired between gold electrodes under ambient conditions by pressing the tip of a scanning tunnelling microscope (STM) onto one of the C60 groups. The STM allows us to identify a single molecule before the junction is formed through imaging, which means unambiguously that only one molecule is wired. Once lifted, the same molecule could be wired many times as it was strongly fixed to the tip, and a high conductance state close to 10−2 G0 is found. The results also suggest that the relative conductance fluctuations are low as a result of the low mobility of the molecule. Theoretical analysis indicates that the molecule is connected directly to one electrode through the central fluorene, and that to bind it to the gold fully it has to be pushed through a layer of adsorbates naturally present in the experiment.

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