Magnetic interactions between vacancy-induced intrinsic magnetic impurities in single-wall carbon nanotubes

Xiao Kong, Jing He, Yang Li, Su-Peng Kou and Ying Liang ()
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Xiao Kong: Beijing Normal University
Jing He: Hebei Normal University
Yang Li: Beijing Normal University
Su-Peng Kou: Beijing Normal University
Ying Liang: Beijing Normal University

The European Physical Journal B: Condensed Matter and Complex Systems, 2016, vol. 89, issue 9, 1-8

Abstract: Abstract Spin-half paramagnetism induced by point detects was found in graphene recently, micromechanism of this magnetic response can be explained well by the intrinsic magnetic impurity theory. In this paper, we apply this theory to two types of single-walled carbon nanotubes (SWCNs) and calculate the properties of various magnetic interactions for comparison. Interestingly, magnetic interactions have different behaviors in these systems. Following our calculation, within a short length, the interactions can be suppressed by ether size effect or a tiny band gap, and then exhibit exponentially decaying. However, in the absence of a band gap, the RKKY interaction could leave a tiny tail at long range, which determines long range magnetic order. Further more, when a tiny band gap exist in the systems, the Heisenberg coupling is the dominate one due to the expanded wavefunction. According to these result, vacancy states in different types of SWCNs could form different magnetic order, bringing abundant candidates for application.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1140/epjb/e2016-70212-6

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