Ferromagnetic kinetic exchange interaction in magnetic insulators

Autor:	Huang, Zhishuo, Liu, Dan, Mansikkamäki, Akseli, Vieru, Veacheslav, Iwahara, Naoya, Chibotaru, Liviu F.
Rok vydání:	2019
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Materials Science Physics - Chemical Physics
Zdroj:	Phys. Rev. Research 2, 033430 (2020)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevResearch.2.033430
Popis:	The superexchange theory predicts dominant antiferromagnetic kinetic interaction when the orbitals accommodating magnetic electrons are covalently bonded through diamagnetic bridging atoms/groups. Here we show that explicit consideration of magnetic and (leading) bridging orbitals, together with the electron transfer between the former, reveals a strong ferromagnetic kinetic exchange contribution. First principle calculations show that it is comparable in strength with antiferromagnetic superexchange in a number of magnetic materials with diamagnetic metal bridges. In particular, it is responsible for a very large ferromagnetic coupling ($-10$ meV) between the iron ions in a Fe$^{3+}$-Co$^{3+}$-Fe$^{3+}$ complex. Comment: Main text: 13 pages, 8 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1912.13274 Zobrazit plný text záznamu View this record from Arxiv