Coexistence of Spin–Lattice Relaxation and Phonon‐Bottleneck Processes in GdIII–Phthlocyaninato Triple‐Decker Complexes under Highly Diluted Conditions. Issue 36 (5th June 2020)

• Record Type: Journal Article
• Authors: Horii, Yoji; Katoh, Keiichi; Miyazaki, Yuji; Damjanović, Marko; Sato, Tetsu; Ungur, Liviu; Chibotaru, Liviu F.; Breedlove, Brian K.; Nakano, Motohiro; Wernsdorfer, Wolfgang; Yamashita, Masahiro
• Is Part Of: Chemistry. Volume 26:Issue 36(2020)
• Page Start: 8076
• Page End: 8082
• Publication Date: 2020-06-05
• Subjects: gadolinium -- magnetic properties -- phonon-bottleneck effect -- porphyrinoids -- spin–lattice relaxation; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201905796
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: 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. Abstract : Diluting effects : Phthalocyaninato–Gd III complexes with no distinct magnetic anisotropy undergo slow magnetic relaxation processes similar to single‐molecule magnets. Magnetic dilution by doping the Gd III complexes into diamagnetic Y III complexes induced dual magnetic relaxation processes caused by spin–lattice relaxations and phonon‐bottleneck effects (see figure).