Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session W23: Frustrated Magnetism: Spin Glasses and Disordered Systems
3:00 PM–5:36 PM,
Thursday, March 7, 2024
Room: 101C
Sponsoring
Unit:
GMAG
Chair: Joseph Paddison, Oak Ridge National Lab
Abstract: W23.00010 : Bulk Magnetic Properties and Vibrational Raman Scattering Spectroscopy of Four Boron Imidazolate Frameworks*
4:48 PM–5:00 PM
Presenter:
Jackson Davis
(Johns Hopkins University)
Authors:
Jackson Davis
(Johns Hopkins University)
Natalia Drichko
(Johns Hopkins University)
Sara Thoi
(Johns Hopkins University)
Pilar Beccar-Varela
(Johns Hopkins University)
Soumyodip Banerjee
(Johns Hopkins University)
Metal Organic Frameworks (MOFs), compounds consisting of metal ions connected by organic ligands, offer a possibility for tunable magnetic interactions between magnetic metal ions through ligands, creating an ideal space to explore exotic magnetism in real materials. Four MOFs in the boron imidazolate framework (BIF) family containing various magnetic ions connected with a boron imidazolate organic ligand have been studied by magnetization measurements and Raman scattering spectroscopy . Magnetization data reveal four distinct magnetic behaviors, including spin crossover in a paramagnetic system due to crystal electric field effects and superparamagnetism in single-domain ferromagnetic nanoparticles.The different energy regions of lattice modes, metal environment vibrations, and molecular vibrations are shown to act as a reliable fingerprint of the framework lattice, metal environment, and ligand respectively in room temperature Raman spectra. These results establish an efficient method of understanding and assigning vibrational features in metal-organic framework Raman spectra, and demonstrate the existence of magnetic interactions in these MOFs despite extended superexchange pathways between magnetic metal centers.
*Acknowledgement is made to the donors of the American Chemical Society Petroleum Research Fund for funding of this work.
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