title: Ferromagnetism induced by intrinsic defects and boron substitution in single-wall SiC nanotubes.
abstract: On the basis of density functional theory (DFT) methods, we study the magnetic properties and electronic structures of the armchair (4, 4) and zigzag (8, 0) single-wall SiC nanotubes with various vacancies and boron substitution. The calculation results indicate that a Si vacancy could induce the magnetic moments in both armchair (4, 4) and zigzag (8, 0) single-wall SiC nanotubes, which mainly arise from the p orbital of C atoms surrounding Si vacancy, leading to the ferromagnetic coupling. However, a C vacancy could only bring about the magnetic moment in armchair (4, 4) single-wall SiC nanotube, which mainly originates from the polarization of Si p electrons, leading to the antiferromagnetic coupling. In addition, for both kinds of single-wall SiC nanotubes, magnetic moments can be induced by a boron atom substituting for C atom. When two boron atoms locate nearest neighbored, both kinds of single-wall Si(C, B) nanotubes exhibit antiferromagnetic coupling.
authors.affiliation: School of Physics, State Key Laboratory for Crystal Materials, Shandong University, Jinan 250100, People's Republic of China.
authors.forename: Yongjia
authors.initials: Y
authors.lastname: Zhang
authors.forename: Hongwei
authors.initials: H
authors.lastname: Qin
authors.forename: Ensi
authors.initials: E
authors.lastname: Cao
authors.forename: Feng
authors.initials: F
authors.lastname: Gao
authors.forename: Hua
authors.initials: H
authors.lastname: Liu
authors.forename: Jifan
authors.initials: J
authors.lastname: Hu