Evolution of cooperativity in the spin transition of an iron(II) complex on a graphite surface

Lalminthang Kipgen (), Matthias Bernien, Sascha Ossinger, Fabian Nickel, Andrew J. Britton, Lucas M. Arruda, Holger Naggert, Chen Luo, Christian Lotze, Hanjo Ryll, Florin Radu, Enrico Schierle, Eugen Weschke, Felix Tuczek and Wolfgang Kuch ()
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Lalminthang Kipgen: Freie Universität Berlin
Matthias Bernien: Freie Universität Berlin
Sascha Ossinger: Christian-Albrechts-Universität zu Kiel
Fabian Nickel: Freie Universität Berlin
Andrew J. Britton: Freie Universität Berlin
Lucas M. Arruda: Freie Universität Berlin
Holger Naggert: Christian-Albrechts-Universität zu Kiel
Chen Luo: Universität Regensburg
Christian Lotze: Freie Universität Berlin
Hanjo Ryll: Helmholtz-Zentrum Berlin für Materialien und Energie
Florin Radu: Helmholtz-Zentrum Berlin für Materialien und Energie
Enrico Schierle: Helmholtz-Zentrum Berlin für Materialien und Energie
Eugen Weschke: Helmholtz-Zentrum Berlin für Materialien und Energie
Felix Tuczek: Christian-Albrechts-Universität zu Kiel
Wolfgang Kuch: Freie Universität Berlin

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Cooperative effects determine the spin-state bistability of spin-crossover molecules (SCMs). Herein, the ultimate scale limit at which cooperative spin switching becomes effective is investigated in a complex [Fe(H2B(pz)2)2(bipy)] deposited on a highly oriented pyrolytic graphite surface, using x-ray absorption spectroscopy. This system exhibits a complete thermal- and light-induced spin transition at thicknesses ranging from submonolayers to multilayers. On increasing the coverage from 0.35(4) to 10(1) monolayers, the width of the temperature-induced spin transition curve narrows significantly, evidencing the buildup of cooperative effects. While the molecules at the submonolayers exhibit an apparent anticooperative behavior, the multilayers starting from a double-layer exhibit a distinctly cooperative spin switching, with a free-molecule-like behavior indicated at around a monolayer. These observations will serve as useful guidelines in designing SCM-based devices.

Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-05399-8

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DOI: 10.1038/s41467-018-05399-8

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