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Spectroscopic Studies of the Magnetic Excitation and Spin‐Phonon Couplings in a Single‐Molecule Magnet
Author(s) -
Stavretis Shelby E.,
Moseley Duncan H.,
Fei Fan,
Cui HuiHui,
Cheng Yongqiang,
Podlesnyak Andrey A.,
Wang Xiaoping,
Daemen Luke L.,
Hoffmann Christina M.,
Ozerov Mykhaylo,
Lu Zhengguang,
Thirunavukkuarasu Komalavalli,
Smirnov Dmitry,
Chang Tieyan,
Chen YuSheng,
RamirezCuesta Anibal J.,
Chen XueTai,
Xue ZiLing Ben
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201903635
Subject(s) - phonon , condensed matter physics , excited state , inelastic neutron scattering , coupling (piping) , spin (aerodynamics) , relaxation (psychology) , inductive coupling , excitation , magnetic moment , physics , atomic physics , inelastic scattering , scattering , materials science , optics , quantum mechanics , psychology , social psychology , metallurgy , thermodynamics
Large separations between ground and excited magnetic states in single‐molecule magnets (SMMs) are desirable to reduce the likelihood of spin reversal in the molecules. Spin‐phonon coupling is a process leading to magnetic relaxation. Both the reversal and coupling, making SMMs lose magnetic moments, are undesirable. However, direct determination of large magnetic states separations (>45 cm −1 ) is challenging, and few detailed investigations of the spin‐phonon coupling have been conducted. The magnetic separation in [Co(12‐crown‐4) 2 ](I 3 ) 2 (12‐crown‐4) ( 1 ) is determined and its spin‐phonon coupling is probed by inelastic neutron scattering (INS) and far‐IR spectroscopy. INS, using oriented single crystals, shows a magnetic transition at 49.4(1.0) cm −1 . Far‐IR reveals that the magnetic transition and nearby phonons are coupled, a rarely observed phenomenon, with spin‐phonon coupling constants of 1.7–2.5 cm −1 . The current work spectroscopically determines the ground–excited magnetic states separation in an SMM and quantifies its spin‐phonon coupling, shedding light on the process causing magnetic relaxation.