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Coexistence of Spin–Lattice Relaxation and Phonon‐Bottleneck Processes in Gd III –Phthlocyaninato Triple‐Decker Complexes under Highly Diluted Conditions
Author(s) -
Horii Yoji,
Katoh Keiichi,
Miyazaki Yuji,
Damjanović Marko,
Sato Tetsu,
Ungur Liviu,
Chibotaru Liviu F.,
Breedlove Brian K.,
Nakano Motohiro,
Wernsdorfer Wolfgang,
Yamashita Masahiro
Publication year - 2020
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.201905796
Subject(s) - diamagnetism , magnetic relaxation , relaxation (psychology) , chemistry , condensed matter physics , spin–lattice relaxation , magnetic anisotropy , phonon , magnet , anisotropy , paramagnetism , materials science , nuclear magnetic resonance , chemical physics , magnetization , magnetic field , physics , psychology , social psychology , quantum mechanics
Gd 3+ complexes have been shown to undergo unusual slow magnetic relaxation processes similar to those of single‐molecule magnets (SMMs), even though Gd 3+ does not exhibit strong magnetic anisotropy. To reveal the origin of the slow magnetic relaxation of Gd 3+ complexes, we have investigated the magnetic properties and heat capacities of two Gd 3+ ‐phthalocyaninato triple‐decker complexes, one of which has intramolecular Gd 3+ –Gd 3+ interactions and the other does not. It was found that the Gd 3+ –Gd 3+ interactions accelerate the magnetic relaxation processes. In addition, magnetically diluted samples, prepared by doping a small amount of the Gd 3+ complexes into a large amount of diamagnetic Y 3+ complexes, underwent dual magnetic relaxation processes. A detailed dynamic magnetic analysis revealed that the coexistence of spin–lattice relaxation and phonon‐bottleneck processes is the origin of the dual magnetic relaxation processes.