Analysis of vibronic coupling in a 4f molecular magnet with FIRMS

Jon G. C. Kragskow, Jonathan Marbey, Christian D. Buch, Joscha Nehrkorn, Mykhaylo Ozerov, Stergios Piligkos (), Stephen Hill () and Nicholas F. Chilton ()
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Jon G. C. Kragskow: University of Manchester
Jonathan Marbey: National High Magnetic Field Laboratory
Christian D. Buch: University of Copenhagen
Joscha Nehrkorn: National High Magnetic Field Laboratory
Mykhaylo Ozerov: National High Magnetic Field Laboratory
Stergios Piligkos: University of Copenhagen
Stephen Hill: National High Magnetic Field Laboratory
Nicholas F. Chilton: University of Manchester

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Vibronic coupling, the interaction between molecular vibrations and electronic states, is a fundamental effect that profoundly affects chemical processes. In the case of molecular magnetic materials, vibronic, or spin-phonon, coupling leads to magnetic relaxation, which equates to loss of magnetic memory and loss of phase coherence in molecular magnets and qubits, respectively. The study of vibronic coupling is challenging, and most experimental evidence is indirect. Here we employ far-infrared magnetospectroscopy to directly probe vibronic transitions in [Yb(trensal)] (where H3trensal = 2,2,2-tris(salicylideneimino)trimethylamine). We find intense signals near electronic states, which we show arise due to an “envelope effect” in the vibronic coupling Hamiltonian, which we calculate fully ab initio to simulate the spectra. We subsequently show that vibronic coupling is strongest for vibrational modes that simultaneously distort the first coordination sphere and break the C3 symmetry of the molecule. With this knowledge, vibrational modes could be identified and engineered to shift their energy towards or away from particular electronic states to alter their impact. Hence, these findings provide new insights towards developing general guidelines for the control of vibronic coupling in molecules.

Date: 2022
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DOI: 10.1038/s41467-022-28352-2

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