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双层钴材料中的低温铁磁有序

Low-Temperature Ferromagnetic Order in a Two-Level Layered Co Material.

作者信息

Doheny Patrick W, Stenning Gavin B G, Brookfield Adam, Orlandi Fabio, Collison David, Manuel Pascal, Carr Sam T, Saines Paul J

机构信息

School of Chemistry and Forensic Science, Ingram Building, University of Kent, Canterbury CT2 7NH, U.K.

ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U.K.

出版信息

Chem Mater. 2024 Aug 9;36(17):8208-8216. doi: 10.1021/acs.chemmater.4c00596. eCollection 2024 Sep 10.

DOI:10.1021/acs.chemmater.4c00596
PMID:39279907
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11393796/
Abstract

The magnetic properties of a 2D layered material consisting of high-spin Co complexes, [Co(NHNH)(HO)Cl]Cl ( ), have been extensively characterized using electron paramagnetic resonance, magnetic susceptibility, and low-temperature heat capacity measurements. Electron paramagnetic resonance spectroscopy studies suggest that below 50 K, the = 3/2 orbital triplet state of Co is gradually depopulated in favor of the = 1/2 spin state, which is dominant below 20 K. In light of this, the magnetic susceptibility has been fitted with a two-level model, indicating that the interactions in this material are much weaker than previously thought. This two-level model is unable to fit the data at low temperatures and, combined with electron paramagnetic resonance spectroscopy, suggests that ferromagnetic interactions between Co cations in the = 1/2 state become significant approaching 2 K. Heat capacity measurements suggest the emergence of a long-range ordered state below 246 mK, which neutron diffraction confirms to be ferromagnetic.

摘要

由高自旋钴配合物[Co(NHNH)(HO)Cl]Cl（ ）组成的二维层状材料的磁性，已通过电子顺磁共振、磁化率和低温热容测量进行了广泛表征。电子顺磁共振光谱研究表明，在50 K以下，钴的 = 3/2轨道三重态逐渐减少，有利于 = 1/2自旋态，该自旋态在20 K以下占主导。据此，磁化率已用双能级模型拟合，表明该材料中的相互作用比先前认为的要弱得多。这个双能级模型无法拟合低温下的数据，结合电子顺磁共振光谱表明， = 1/2态的钴阳离子之间的铁磁相互作用在接近2 K时变得显著。热容测量表明在246 mK以下出现了长程有序状态，中子衍射证实为铁磁有序。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/8ead90da2006/cm4c00596_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/c8af7c3b77bb/cm4c00596_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/4b93c0297e57/cm4c00596_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/1708aabbaad6/cm4c00596_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/30a0be52eac5/cm4c00596_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/7888b7c4f88f/cm4c00596_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/8ead90da2006/cm4c00596_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/c8af7c3b77bb/cm4c00596_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/4b93c0297e57/cm4c00596_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/1708aabbaad6/cm4c00596_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/30a0be52eac5/cm4c00596_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/7888b7c4f88f/cm4c00596_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7d44/11393796/8ead90da2006/cm4c00596_0006.jpg

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