Horii Yoji, Katoh Keiichi, Miyazaki Yuji, Damjanović Marko, Sato Tetsu, Ungur Liviu, Chibotaru Liviu F, Breedlove Brian K, Nakano Motohiro, Wernsdorfer Wolfgang, Yamashita Masahiro
Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai, Miyagi, 980-8578, Japan.
Chemistry. 2020 Jun 26;26(36):8076-8082. doi: 10.1002/chem.201905796. Epub 2020 Jun 5.
Gd complexes have been shown to undergo unusual slow magnetic relaxation processes similar to those of single-molecule magnets (SMMs), even though Gd does not exhibit strong magnetic anisotropy. To reveal the origin of the slow magnetic relaxation of Gd complexes, we have investigated the magnetic properties and heat capacities of two Gd -phthalocyaninato triple-decker complexes, one of which has intramolecular Gd -Gd interactions and the other does not. It was found that the Gd -Gd interactions accelerate the magnetic relaxation processes. In addition, magnetically diluted samples, prepared by doping a small amount of the Gd complexes into a large amount of diamagnetic Y 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.
钆配合物已被证明会经历与单分子磁体（SMMs）类似的异常缓慢的磁弛豫过程，尽管钆并不表现出强磁各向异性。为了揭示钆配合物缓慢磁弛豫的起源，我们研究了两种钆-酞菁三夹心配合物的磁性和热容，其中一种具有分子内钆-钆相互作用，另一种则没有。结果发现，钆-钆相互作用加速了磁弛豫过程。此外，通过将少量钆配合物掺杂到大量抗磁性钇配合物中制备的磁稀释样品经历了双重磁弛豫过程。详细的动态磁性分析表明，自旋-晶格弛豫和声子瓶颈过程的共存是双重磁弛豫过程的起源。
