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Persistent URL http://purl.org/net/epubs/work/49719
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Record Id 49719
Title Modeling spin interactions in carbon peapods using a hybrid density functional theory
Contributors
Abstract The Sc @ C-82 endohedral fullerenes inside a single-wall semiconducting or metallic nanotube form a well-defined chain of antiferromagnetically coupled spins. Using hybrid density functional theory (DFT), we find that the spin resides mainly on the fullerene cage, whether or not the fullerenes are in a nanotube. The spin interactions decay exponentially with fullerene separation and the system can be described by a simple antiferromagnetic Heisenberg spin chain. Energy parameters for a generalized Hubbard-Anderson model are deduced from the DFT calculations and yield a second-order Heisenberg exchange energy, which is in good agreement with total-energy calculations for parallel and antiparallel spin configurations. Within the accuracy of the calculations, neither semiconducting nor metallic nanotubes affect the interactions between the fullerene electron spins.
Organisation CSE , CSE-CMSG , STFC
Keywords Materials , SC-AT-C-82 , Encapsulated C-60 , Exchange
Funding Information
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article Phys Rev B 77, no. 23 (2008): 235416. doi:10.1103/PhysRevB.77.235416 peapod_spin_prb08.pdf 2008
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