BENIWAL, Sumit; ZHANG, X.; MU, Sai; NAIM, Ahmad; ROSA, Patrick; CHASTANET, Guillaume; LÉTARD, Jean-François; LIU, J.; STERBINSKY, George E.; ARENA, Dario A.; DOWBEN, Peter A.; ENDERS, Axel

doi:10.1088/0953-8984/28/20/206002

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BENIWAL, Sumit
Department of Physics and Astronomy [Lincoln]

ZHANG, X.
Department of Physics and Astronomy [Lincoln]

MU, Sai
Department of Physics and Astronomy [Lincoln]

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Article de revue

Ce document a été publié dans

Journal of Physics: Condensed Matter. 2016, vol. 28, n° 20, p. 206002

IOP Publishing

Résumé en anglais

Temperature- and coverage-dependent studies of the Au(1 1 1)-supported spin crossover Fe(II) complex (SCO) of the type [Fe(H2B(pz)2)2(bipy)] with a suite of surface-sensitive spectroscopy and microscopy tools show that the substrate inhibits thermally induced transitions of the molecular spin state, so that both high-spin and low-spin states are preserved far beyond the spin transition temperature of free molecules. Scanning tunneling microscopy confirms that [Fe(H2B(pz)2)2(bipy)] grows as ordered, molecular bilayer islands at sub-monolayer coverage and as disordered film at higher coverage. The temperature dependence of the electronic structure suggest that the SCO films exhibit a mixture of spin states at room temperature, but upon cooling below the spin crossover transition the film spin state is best described as a mix of high-spin and low-spin state molecules of a ratio that is constant. This locking of the spin state is most likely the result of a substrate-induced conformational change of the interfacial molecules, but it is estimated that also the intra-atomic electron–electron Coulomb correlation energy, or Hubbard correlation energy U, could be an additional contributing factor.< Réduire

Mots clés en anglais

spin-crossover

Fe(II) spin-crossover

molecular magnetism

spin state locking

DOI

http://dx.doi.org/10.1088/0953-8984/28/20/206002

Project ANR

Éléments de mémoires multifonctionnels utilisant des connections supramoléculaires auto assemblées

Origine

Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026