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Neutron studies of a high spin Fe$_{19}$ molecular nanodisc

Pratt, Francis L.; Guidi, Tatiana; Manuel, Pascal; Anson, Christopher E. 1; Tang, Jinkui; Blundell, Stephen J.; Powell, Annie K. 1
1 Institut für Anorganische Chemie (AOC), Karlsruher Institut für Technologie (KIT)


The molecular cluster system [Fe$_{19}$(metheidi)$_{10}$(OH)$_{14}$O$_{6}$(H$_{2}$O)$_{12}$]NO$_{3}$·24H$_{2}$O, abbreviated as Fe$_{19}$, contains nineteen Fe(III) ions arranged in a disc-like structure with the total spin S = 35/2. For the first order, it behaves magnetically as a single molecule magnet with a 16 K anisotropy barrier. The high spin value enhances weak intermolecular interactions for both dipolar and superexchange mechanisms and an eventual transition to antiferromagnetic order occurs at 1.2 K. We used neutron diffraction to determine both the mode of ordering and the easy spin axis. The observed ordering was not consistent with a purely dipolar driven order, indicating a significant contribution from intermolecular superexchange. The easy axis is close to the molecular Fe1–Fe10 axis. Inelastic neutron scattering was used to follow the magnetic order parameter and to measure the magnetic excitations. Direct transitions to at least three excited states were found in the 2 to 3 meV region. Measurements below 0.2 meV revealed two low energy excited states, which were assigned to S = 39/2 and S = 31/2 spin states with respective excitation gaps of 1.5 and 3 K. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000133983
Veröffentlicht am 20.09.2021
DOI: 10.3390/magnetochemistry7060074
Zitationen: 2
Web of Science
Zitationen: 2
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Anorganische Chemie (AOC)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2312-7481, 2226-471X
KITopen-ID: 1000133983
HGF-Programm 47.12.02 (POF IV, LK 01) Exploratory Qubits
Weitere HGF-Programme 43.32.01 (POF IV, LK 01) Molecular Materials Basis for Optics & Photonics
Erschienen in Magnetochemistry
Verlag MDPI
Band 7
Heft 6
Seiten 74
Schlagwörter magnetic molecular cluster; high spin molecule; single molecule magnet; magnetic nanodisc; neutron diffraction; inelastic neutron scattering; dipolar driven magnetism; Monte Carlo simulation; weak superexchange interactions
Nachgewiesen in Dimensions
Web of Science
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